{"title":"Unicel Hot Tub \u0026 Spa Filters","description":"\u003cp\u003eShop Unicel replacement hot tub and spa filter cartridges by exact model number. Compare each product's listed dimensions, end caps, openings and connections with your existing cartridge before ordering.\u003c\/p\u003e\u003cp\u003eSpa brand alone does not confirm fit. Check your current filter number and your spa owner's manual, or contact Red Rock Spas for help identifying the correct replacement.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/collections\/hot-tub-filters\"\u003eShop all hot tub filters\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/how-often-to-clean-replace-spa-filter\"\u003eLearn when to clean and replace your spa filter\u003c\/a\u003e\u003c\/p\u003e","products":[{"product_id":"4ch-949-filter","title":"Unicel 4CH-949 Spa Filter Cartridge – 50 Sq Ft","description":"\u003cp\u003e\u003cstrong\u003eUnicel 4CH-949 4000 Series Pleated Filter Cartridge \u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e50 sq. ft. | 13-1\/2\" x 4-15\/16\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Unicel 4CH-949 filter cartridge is commonly used in many Cal Spas hot tubs and swim spas, delivering reliable water filtration and strong flow performance. While many filter cartridges may appear similar, the internal materials, construction quality, and fitment make a major difference in filtration efficiency and lifespan.\u003c\/p\u003e\n\u003cp\u003eUnicel cartridges are manufactured to precise OEM specifications to ensure proper fit, sealing, and performance in your spa system. Built with high-quality filtration media and durable construction, Unicel filters help maintain cleaner water, improve circulation, and protect spa components from unnecessary wear.\u003c\/p\u003e\n\u003cp\u003eFor over 60 years, Unicel has remained a trusted leader in pool and spa filtration products. Don’t settle for low-quality imitations — choose genuine Unicel filters for dependable performance in your Cal Spas hot tub or swim spa.\u003c\/p\u003e\u003cp\u003eConfirm your existing filter part number and fit before ordering. \u003ca href=\"\/collections\/hot-tub-filters\"\u003eBrowse hot tub filters\u003c\/a\u003e.\u003c\/p\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":46340566941845,"sku":null,"price":62.11,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/2142\/2741\/files\/IMG-3850.png?v=1778906353"},{"product_id":"unicel-5ch-37-aquaterra-freeflow-spa-filter","title":"Unicel 5CH-37 Aquaterra Spa Filter – 37.5 Sq Ft | 303279","description":"\u003ch3\u003eUnicel 5CH-37 Replacement Spa Filter Cartridge\n\u003c\/h3\u003e\n\u003cp\u003eKeep your hot tub water clean and clear with the \u003cstrong\u003eUnicel 5CH-37 replacement spa filter cartridge\u003c\/strong\u003e. Designed as a replacement filter for select \u003cstrong\u003eAquaterra, Freeflow, Watkins and other compatible spas\u003c\/strong\u003e, the 5CH-37 provides \u003cstrong\u003e37.5 square feet of premium filtration area\u003c\/strong\u003e. \u003c\/p\u003e\n\u003cp\u003eThe Unicel 5CH-37 uses durable \u003cstrong\u003e3 oz. filtration media with 221 pleats\u003c\/strong\u003e to capture dirt, oils and other debris while maintaining efficient water flow through your spa. Its threaded design provides a secure fit and makes routine filter replacement simple. \u003c\/p\u003e\n\u003cp\u003eThis cartridge is an excellent replacement for customers searching by \u003cstrong\u003eWatkins 303279, 78460, Filbur FC-2402 or Pleatco PFF42TC-P4\u003c\/strong\u003e. \u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine \u003cstrong\u003eUnicel 5CH-37\u003c\/strong\u003e replacement spa filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e37.5 sq. ft.\u003c\/strong\u003e filtration area\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e221 pleats\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003ePremium \u003cstrong\u003e3 oz. filter media\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e5-5\/16\" outside diameter\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e9\" cartridge length\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eTop handle for easy removal\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e1-1\/2\" male threaded \/ MPT bottom\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eDesigned for excellent dirt capture and water flow\u003c\/li\u003e\n\u003cli\u003eMade in the USA \n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Unicel\u003cbr\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 5CH-37\u003cbr\u003e\u003cstrong\u003eFilter Area:\u003c\/strong\u003e 37.5 sq. ft.\u003cbr\u003e\u003cstrong\u003eOutside Diameter:\u003c\/strong\u003e 5-5\/16\"\u003cbr\u003e\u003cstrong\u003eLength:\u003c\/strong\u003e 9\"\u003cbr\u003e\u003cstrong\u003ePleat Count:\u003c\/strong\u003e 221\u003cbr\u003e\u003cstrong\u003eFilter Media:\u003c\/strong\u003e 3 oz. polyester\u003cbr\u003e\u003cstrong\u003eTop:\u003c\/strong\u003e Handle\u003cbr\u003e\u003cstrong\u003eBottom:\u003c\/strong\u003e 1-1\/2\" Male Thread \/ MPT\u003cbr\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Aquaterra and compatible spa filtration systems \u003c\/p\u003e\n\u003ch3\u003eCross References\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnicel:\u003c\/strong\u003e 5CH-37\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWatkins \/ Aquaterra:\u003c\/strong\u003e 303279\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWatkins \/ Freeflow:\u003c\/strong\u003e 78460\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilbur:\u003c\/strong\u003e FC-2402\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePleatco:\u003c\/strong\u003e PFF42TC-P4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDarlly:\u003c\/strong\u003e 50406\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePure N Clean:\u003c\/strong\u003e PC-2402\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpa Daddy:\u003c\/strong\u003e SD-01322\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWatkins:\u003c\/strong\u003e ACT-50SQFLTR\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWatkins:\u003c\/strong\u003e LSX1057 \n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatible Spa Brands\u003c\/h3\u003e\n\u003cp\u003eThe 5CH-37 and its equivalent cartridges are commonly used in select:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eAquaterra Spas\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFreeflow Spas\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFantasy Spas\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eLifesmart Spas\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWatkins-manufactured spas\u003c\/strong\u003e \n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCompatibility varies by model and year. \u003cstrong\u003eAlways verify your existing filter's part number, dimensions and 1-1\/2\" threaded connection before ordering.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003eWhy Buy From Red Rock Spas?\u003c\/h3\u003e\n\u003cp\u003eRed Rock Spas carries premium replacement hot tub filters, spa parts, water-care products and accessories. If you're unsure whether the Unicel 5CH-37 fits your hot tub, our team can help identify the correct replacement cartridge.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/collections\/hot-tub-filters\"\u003eShop all hot tub and spa filters\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/how-often-to-clean-replace-spa-filter\"\u003eFilter cleaning and replacement guide\u003c\/a\u003e\u003c\/p\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":46340568514709,"sku":"269","price":49.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/2142\/2741\/files\/unicel-5ch-37-aquaterra-spa-filter-main.jpg?v=1788372294"},{"product_id":"unicel-5ch-402-spa-filter-6540-723-fc-2811-replacement","title":"Unicel 5CH-402 Spa Filter – 40 Sq Ft | 6540-723 \/ FC-2811","description":"\u003ch3\u003eUnicel 5CH-402 40 Sq Ft Replacement Spa Filter\n\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eUnicel 5CH-402\u003c\/strong\u003e is a premium 40-square-foot replacement hot tub filter designed for select \u003cstrong\u003eSundance, Jacuzzi and Del Sol spas\u003c\/strong\u003e. Its high-quality filtration media helps capture dirt, oils and debris while maintaining efficient water flow through your spa filtration system.\u003c\/p\u003e\n\u003cp\u003eThe 5CH-402 features a \u003cstrong\u003e5-3\/16\" outside diameter, 10-3\/4\" length, top handle and 2\" male threaded\/MPT connection\u003c\/strong\u003e, making it a direct replacement for several common OEM and aftermarket filter numbers. \u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine \u003cstrong\u003eUnicel 5CH-402\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e40 sq. ft.\u003c\/strong\u003e filtration area\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e204 pleats\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003ePremium \u003cstrong\u003e3 oz. Reemay filtration media\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e5-3\/16\" outside diameter\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e10-3\/4\" length\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eConvenient top handle\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2\" male thread\/MPT\u003c\/strong\u003e bottom connection\u003c\/li\u003e\n\u003cli\u003eDesigned for select Sundance, Jacuzzi and Del Sol spas\u003c\/li\u003e\n\u003cli\u003eMade in the USA \n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Unicel\u003cbr\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 5CH-402\u003cbr\u003e\u003cstrong\u003eFilter Area:\u003c\/strong\u003e 40 sq. ft.\u003cbr\u003e\u003cstrong\u003eOutside Diameter:\u003c\/strong\u003e 5-3\/16\"\u003cbr\u003e\u003cstrong\u003eLength:\u003c\/strong\u003e 10-3\/4\"\u003cbr\u003e\u003cstrong\u003ePleat Count:\u003c\/strong\u003e 204\u003cbr\u003e\u003cstrong\u003eMedia:\u003c\/strong\u003e 3 oz. filtration media\u003cbr\u003e\u003cstrong\u003eTop:\u003c\/strong\u003e Handle\u003cbr\u003e\u003cstrong\u003eBottom:\u003c\/strong\u003e 2\" Male Thread \/ MPT\u003cbr\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Select Sundance, Jacuzzi and Del Sol spas \u003c\/p\u003e\n\u003ch3\u003eCross-Reference Part Numbers\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnicel:\u003c\/strong\u003e 5CH-402\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSundance \/ Jacuzzi OEM:\u003c\/strong\u003e 6540-723\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilbur:\u003c\/strong\u003e FC-2811\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePleatco:\u003c\/strong\u003e PJW40SC-F2M\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDel Sol:\u003c\/strong\u003e 50403 \n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpa Compatibility\u003c\/h3\u003e\n\u003cp\u003eThe Unicel 5CH-402 is commonly associated with select \u003cstrong\u003eDel Sol Redondo and Hermosa spas\u003c\/strong\u003e and applications using OEM filter \u003cstrong\u003e6540-723\u003c\/strong\u003e. \u003c\/p\u003e\n\u003cp\u003eBecause spa manufacturers can change filters between model years, always compare your existing \u003cstrong\u003epart number, diameter, length and threaded connection\u003c\/strong\u003e before ordering.\u003c\/p\u003e\n\u003ch3\u003eWhy Buy From Red Rock Spas?\u003c\/h3\u003e\n\u003cp\u003eRed Rock Spas supplies premium replacement hot tub filters, spa parts, water-care products and accessories. If you're unsure whether the Unicel 5CH-402 is the correct replacement for your spa, our team can help you identify the proper filter.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/collections\/hot-tub-filters\"\u003eShop all hot tub and spa filters\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/how-often-to-clean-replace-spa-filter\"\u003eFilter cleaning and replacement guide\u003c\/a\u003e\u003c\/p\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":46340568547477,"sku":"313","price":49.18,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/2142\/2741\/files\/unicel-5ch-402-40-sq-ft-spa-filter-main.jpg?v=1788373936"},{"product_id":"unicel-5ch-502-marquis-cal-spas-filter","title":"Unicel 5CH-502 Marquis \u0026 Cal Spas Filter – 50 Sq Ft | FC-0195","description":"\u003ch2\u003eUnicel 5CH-502 Replacement Spa Filter Cartridge — 50 Sq. Ft.\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eUnicel 5CH-502\u003c\/strong\u003e is a premium 50-square-foot replacement hot tub filter cartridge designed for select \u003cstrong\u003eMarquis Spas\u003c\/strong\u003e and \u003cstrong\u003eCal Spas\u003c\/strong\u003e hot tubs. Using quality 3 oz. filtration media, this cartridge captures dirt, body oils, debris, and other contaminants while maintaining proper water flow through your spa's filtration system — helping keep your water clean and clear.\u003c\/p\u003e\n\n\u003cp\u003eThis filter is the direct OEM replacement for Unicel part number \u003cstrong\u003e5CH-502\u003c\/strong\u003e (formerly listed as \u003cstrong\u003eC-5303\u003c\/strong\u003e) and cross-references with Filbur \u003cstrong\u003eFC-0195\u003c\/strong\u003e, Pleatco \u003cstrong\u003ePPM50SC-F2M\u003c\/strong\u003e, and several Marquis and Cal Spas OEM part numbers.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUnicel Part Number:\u003c\/strong\u003e 5CH-502\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFilter Area:\u003c\/strong\u003e 50 sq. ft.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutside Diameter:\u003c\/strong\u003e Approximately 5-3\/16\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e Approximately 12-1\/2\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTop:\u003c\/strong\u003e Bar handle for easy removal\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBottom:\u003c\/strong\u003e 2\" male MPT threaded connection\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFilter Media:\u003c\/strong\u003e 3 oz. filtration media\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eGenuine Unicel 5CH-502 replacement spa filter\u003c\/li\u003e\n  \u003cli\u003e50 sq. ft. filtration area for efficient water cleaning\u003c\/li\u003e\n  \u003cli\u003eTop bar handle for convenient, tool-free removal\u003c\/li\u003e\n  \u003cli\u003e2\" male MPT threaded bottom connection\u003c\/li\u003e\n  \u003cli\u003eHelps capture dirt, oils, debris, and contaminants\u003c\/li\u003e\n  \u003cli\u003eDesigned to maintain efficient spa water flow\u003c\/li\u003e\n  \u003cli\u003eDesigned for select Marquis Spas and Cal Spas hot tubs\u003c\/li\u003e\n  \u003cli\u003eMade in USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatibility — Commonly Used With\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eMarquis Spas\u003c\/li\u003e\n  \u003cli\u003eCal Spas\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCross-Reference \/ Replacement Part Numbers\u003c\/h3\u003e\n\u003cp\u003eCustomers searching for any of the following part numbers may find this filter to be a compatible replacement:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUnicel:\u003c\/strong\u003e 5CH-502 | C-5303\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFilbur:\u003c\/strong\u003e FC-0195\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePleatco:\u003c\/strong\u003e PPM50SC-F2M\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMarquis:\u003c\/strong\u003e 20041 | 20091 | 370-0237\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCal Spas:\u003c\/strong\u003e FIL11100202\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDarlly:\u003c\/strong\u003e 50501\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAdditional:\u003c\/strong\u003e XLS-522 | MA50\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e⚠️ Compatibility Notice\u003c\/h3\u003e\n\u003cp\u003eSpa filter compatibility can vary by model and year. Before ordering, please verify that your existing filter matches the \u003cstrong\u003eUnicel 5CH-502\u003c\/strong\u003e by comparing the manufacturer part number, outside diameter (~5-3\/16\"), length (~12-1\/2\"), top configuration (bar handle), and 2\" male MPT threaded bottom connection.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Buy From Red Rock Spas?\u003c\/h3\u003e\n\u003cp\u003eRed Rock Spas supplies premium hot tub filters, replacement spa parts, water-care products, and spa accessories. If you're not sure whether the \u003cstrong\u003eUnicel 5CH-502\u003c\/strong\u003e is the correct replacement filter for your hot tub, our team can help you identify the right filter — just reach out before ordering.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/collections\/hot-tub-filters\"\u003eShop all hot tub and spa filters\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/how-often-to-clean-replace-spa-filter\"\u003eFilter cleaning and replacement guide\u003c\/a\u003e\u003c\/p\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":46340568613013,"sku":"584","price":62.66,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/2142\/2741\/files\/unicel-5ch-502-marquis-cal-spas-filter-main.jpg?v=1788375137"},{"product_id":"unicel-6ch-352-replacement-spa-filter","title":"Unicel 6CH-352 Spa Filter | 35 Sq Ft Hot Tub Filter","description":"\u003ch2\u003eUnicel 6CH-352 Replacement Spa Filter Cartridge – 35 Sq. Ft.\u003c\/h2\u003e\n\u003cp\u003eKeep your hot tub water clean, clear, and properly filtered with the Unicel 6CH-352 Replacement Spa Filter Cartridge. Built with premium filtration media and durable components, this replacement hot tub filter is designed to provide dependable water flow, excellent debris capture, and long service life.\u003c\/p\u003e\n\u003cp\u003eThe Unicel 6CH-352 provides 35 square feet of filtration area, helping capture dirt, oils, hair, and other contaminants before they circulate back into your spa water. Unicel replacement cartridges are engineered to meet or exceed OEM filtration requirements and are a trusted choice for hot tub owners looking for a high-quality replacement filter.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Unicel 6CH-352 replacement filter cartridge\u003c\/li\u003e\n\u003cli\u003e35 sq. ft. filtration area\u003c\/li\u003e\n\u003cli\u003ePremium polyester filtration media\u003c\/li\u003e\n\u003cli\u003eDesigned for excellent dirt and debris capture\u003c\/li\u003e\n\u003cli\u003eMaintains efficient water flow through the spa\u003c\/li\u003e\n\u003cli\u003eDurable construction for repeated cleaning\u003c\/li\u003e\n\u003cli\u003eHelps protect pumps, heaters, and other spa equipment\u003c\/li\u003e\n\u003cli\u003eDesigned to meet or exceed OEM filtration specifications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Unicel\u003cbr\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 6CH-352\u003cbr\u003e\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Replacement Hot Tub \/ Spa Filter Cartridge\u003cbr\u003e\u003cstrong\u003eFilter Area:\u003c\/strong\u003e 35 sq. ft.\u003c\/p\u003e\n\u003ch3\u003eFinding the Correct Replacement Filter\u003c\/h3\u003e\n\u003cp\u003eSpa filters can look very similar while using different lengths, diameters, openings, or threaded connections. Before ordering, compare the Unicel 6CH-352 part number and dimensions with your existing filter or consult your spa's owner's manual.\u003c\/p\u003e\n\u003ch3\u003eWhy Choose Unicel?\u003c\/h3\u003e\n\u003cp\u003eUnicel is one of the most recognized manufacturers of replacement pool and spa filter cartridges. Their filters are designed for dependable filtration, efficient water flow, excellent dirt-holding capacity, and long-lasting performance.\u003c\/p\u003e\n\u003cp\u003eRegularly cleaning and replacing your hot tub filter can help maintain clearer water, improve circulation, reduce strain on spa equipment, and keep your hot tub operating efficiently.\u003c\/p\u003e\n\u003ch3\u003eWhy Buy From Red Rock Spas?\u003c\/h3\u003e\n\u003cp\u003eRed Rock Spas specializes in hot tubs, replacement spa parts, filters, water care products, and accessories. Our experienced team can help identify the correct replacement filter for your spa if you're unsure which cartridge you need.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/collections\/hot-tub-filters\"\u003eShop all hot tub and spa filters\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/how-often-to-clean-replace-spa-filter\"\u003eFilter cleaning and replacement guide\u003c\/a\u003e\u003c\/p\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":46340598988949,"sku":"38","price":55.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/2142\/2741\/files\/unicel-6ch-352-spa-filter-main.jpg?v=1788367571"},{"product_id":"unicel-6ch-502-artesian-spa-filter","title":"Unicel 6CH-502 Artesian Spa Filter – 50 Sq Ft | FC-0311","description":"\u003ch2\u003eUnicel 6CH-502 Replacement Spa Filter Cartridge — 50 Sq. Ft.\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eUnicel 6CH-502\u003c\/strong\u003e is a premium 50-square-foot replacement hot tub and spa filter cartridge built to deliver effective filtration while maintaining proper water flow through your spa’s filtration system. Its filtration media helps capture dirt, body oils, debris, and other contaminants to keep your spa water clean and clear.\u003c\/p\u003e\n\n\u003cp\u003eWith an approximately \u003cstrong\u003e6-3\/4-inch outside diameter\u003c\/strong\u003e, \u003cstrong\u003e8-inch length\u003c\/strong\u003e, convenient semi-circular top handle, and \u003cstrong\u003e2-inch male MPT threaded bottom connection\u003c\/strong\u003e, the 6CH-502 cross-references with Filbur \u003cstrong\u003eFC-0311\u003c\/strong\u003e and Pleatco \u003cstrong\u003ePAS50SV-F2M\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUnicel Part Number:\u003c\/strong\u003e 6CH-502\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFilter Area:\u003c\/strong\u003e 50 sq. ft.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutside Diameter:\u003c\/strong\u003e Approximately 6-3\/4\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e Approximately 8\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePleats:\u003c\/strong\u003e 209\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFilter Media:\u003c\/strong\u003e 3 oz.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTop:\u003c\/strong\u003e Semi-circular handle for easy removal\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBottom:\u003c\/strong\u003e 2\" male MPT threaded connection\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eGenuine Unicel 6CH-502 replacement spa filter\u003c\/li\u003e\n  \u003cli\u003e50 sq. ft. filtration area for efficient water cleaning\u003c\/li\u003e\n  \u003cli\u003eApproximately 6-3\/4\" outside diameter\u003c\/li\u003e\n  \u003cli\u003eApproximately 8\" length, 209 pleats\u003c\/li\u003e\n  \u003cli\u003eSemi-circular top handle for convenient, tool-free removal\u003c\/li\u003e\n  \u003cli\u003e2\" male MPT threaded bottom connection\u003c\/li\u003e\n  \u003cli\u003e3 oz. filtration media\u003c\/li\u003e\n  \u003cli\u003eHelps remove dirt, oils, debris, and contaminants\u003c\/li\u003e\n  \u003cli\u003eDesigned to maintain efficient spa water flow\u003c\/li\u003e\n  \u003cli\u003eDurable replacement hot tub filter cartridge\u003c\/li\u003e\n  \u003cli\u003eMade in USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatibility — Commonly Used With\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eSelect Artesian Spas\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCross-Reference \/ Replacement Part Numbers\u003c\/h3\u003e\n\u003cp\u003eCustomers searching for the following part numbers may find this filter to be a compatible replacement:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUnicel:\u003c\/strong\u003e 6CH-502\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFilbur:\u003c\/strong\u003e FC-0311\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePleatco:\u003c\/strong\u003e PAS50SV-F2M\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e⚠️ Fitment Notice\u003c\/h3\u003e\n\u003cp\u003eSpa manufacturers can change filter configurations between models and production years. Before ordering, please compare your existing filter’s manufacturer part number, outside diameter (~6-3\/4\"), overall length (~8\"), semi-circular handle configuration, and 2\" male MPT threaded bottom connection to confirm this is the correct replacement.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Buy From Red Rock Spas?\u003c\/h3\u003e\n\u003cp\u003eRed Rock Spas supplies premium hot tub filters, replacement spa parts, water-care products, and spa accessories. If you’re not sure whether the \u003cstrong\u003eUnicel 6CH-502\u003c\/strong\u003e is the correct replacement filter for your hot tub, our team can help you identify the right filter — just reach out before ordering.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/collections\/hot-tub-filters\"\u003eShop all hot tub and spa filters\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/how-often-to-clean-replace-spa-filter\"\u003eFilter cleaning and replacement guide\u003c\/a\u003e\u003c\/p\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":46340599087253,"sku":"40","price":64.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/2142\/2741\/files\/unicel-6ch-502-spa-filter-main.jpg?v=1788377183"},{"product_id":"unicel-6ch-940-spa-filter-pww50p3-fc-0359-replacement","title":"Unicel 6CH-940 Replacement Spa Filter Cartridge","description":"\u003ch3\u003eUnicel 6CH-940 Replacement Spa Filter Cartridge\n\u003c\/h3\u003e\n\u003cp\u003eKeep your hot tub water clean and clear with the \u003cstrong\u003eUnicel 6CH-940 replacement spa filter cartridge\u003c\/strong\u003e. This popular threaded spa filter is designed for hot tubs using a \u003cstrong\u003e6-inch diameter cartridge with a 1-1\/2-inch SAE threaded connection\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe Unicel 6CH-940 uses premium \u003cstrong\u003e3 oz. filtration media\u003c\/strong\u003e engineered for excellent dirt-holding capacity, water flow, durability, and repeated cleaning. Its semi-circular top handle makes removal easy, while the injection-molded SAE threaded connection provides a secure fit. \u003c\/p\u003e\n\u003cp\u003eThe 6CH-940 is used across numerous spa manufacturers and filtration systems, making it an excellent replacement for several common OEM and aftermarket filter numbers.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine \u003cstrong\u003eUnicel 6CH-940\u003c\/strong\u003e replacement cartridge\u003c\/li\u003e\n\u003cli\u003ePremium \u003cstrong\u003e3 oz. filter media\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e6-inch outside diameter\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e8-1\/4-inch length\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eSemi-circular top handle\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e1-1\/2-inch SAE male threaded connection\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eDesigned for excellent water flow and debris capture\u003c\/li\u003e\n\u003cli\u003eDurable construction for repeated cleaning\u003c\/li\u003e\n\u003cli\u003eCompatible with numerous hot tub brands and filtration systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Unicel\u003cbr\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 6CH-940\u003cbr\u003e\u003cstrong\u003eFilter Area:\u003c\/strong\u003e 45 sq. ft. per current Unicel application guide\u003cbr\u003e\u003cstrong\u003eOutside Diameter:\u003c\/strong\u003e 6\"\u003cbr\u003e\u003cstrong\u003eLength:\u003c\/strong\u003e 8-1\/4\"\u003cbr\u003e\u003cstrong\u003eTop:\u003c\/strong\u003e Semi-Circular Handle\u003cbr\u003e\u003cstrong\u003eBottom:\u003c\/strong\u003e 1-1\/2\" SAE Male Thread\u003cbr\u003e\u003cstrong\u003eFilter Media:\u003c\/strong\u003e 3 oz. Polyester \u003c\/p\u003e\n\u003ch3\u003eCross References\u003c\/h3\u003e\n\u003cp\u003eThe Unicel 6CH-940 cross-references with several popular replacement filters:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnicel:\u003c\/strong\u003e 6CH-940\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePleatco:\u003c\/strong\u003e PWW50P3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilbur:\u003c\/strong\u003e FC-0359\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWaterway:\u003c\/strong\u003e 817-0050\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAber:\u003c\/strong\u003e 03FIL1400\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCMP:\u003c\/strong\u003e 25252\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDarlly:\u003c\/strong\u003e 60401\u003c\/li\u003e\n\u003cli\u003eOther references include \u003cstrong\u003e378902\u003c\/strong\u003e and \u003cstrong\u003ePWW50\u003c\/strong\u003e. \n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatible Spa Brands\u003c\/h3\u003e\n\u003cp\u003eThis filter or its equivalents are used in filtration systems found in numerous spa brands, including \u003cstrong\u003eBullfrog Spas, Master Spas, Dynasty Spas, Catalina Spas, Clearwater Spas, Leisure Bay, Sunrise Spas, Tuff Spas, Viking Spas, Vita Spas\u003c\/strong\u003e, and others. Fitment can vary by model and year. \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAlways verify the part number, 6\" diameter, 8-1\/4\" length and 1-1\/2\" SAE threaded connection against your existing filter before ordering.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003eWhy Buy From Red Rock Spas?\u003c\/h3\u003e\n\u003cp\u003eRed Rock Spas carries premium replacement hot tub filters, spa parts, water-care products and accessories. If you're unsure which replacement cartridge your hot tub requires, our experienced team can help identify the correct filter.\u003cimg\u003e\u003cimg\u003e\u003cimg\u003e\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/collections\/hot-tub-filters\"\u003eShop all hot tub and spa filters\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/how-often-to-clean-replace-spa-filter\"\u003eFilter cleaning and replacement guide\u003c\/a\u003e\u003c\/p\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":46340599120021,"sku":"1626","price":53.87,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/2142\/2741\/files\/unicel-6ch-940-spa-filter-main.jpg?v=1788370677"},{"product_id":"unicel-8ch-951-bullfrog-spa-filter","title":"Unicel 8CH-951 Bullfrog Spa Filter – 40 Sq Ft","description":"\u003cp\u003e\u003cstrong\u003eUnicel 8CH-951 Replacement Spa Filter Cartridge – 40 Sq. Ft.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eKeep your Bullfrog Spa water clean and clear with the \u003cstrong\u003eUnicel 8CH-951 replacement spa filter cartridge\u003c\/strong\u003e. Designed for select \u003cstrong\u003eBullfrog Spas\u003c\/strong\u003e, this premium replacement filter provides \u003cstrong\u003e40 square feet of filtration area\u003c\/strong\u003e with 244 pleats of durable 3 oz. filtration media. \u003c\/p\u003e\n\u003cp\u003eThe Unicel 8CH-951 is designed to capture dirt, oils, hair and other debris while maintaining efficient water flow through your hot tub. Its high-quality construction provides excellent dirt-holding capacity and allows the cartridge to be cleaned and reused throughout its service life.\u003c\/p\u003e\n\u003cp\u003eThe filter features a \u003cstrong\u003esemi-circular top handle\u003c\/strong\u003e for easy removal and a \u003cstrong\u003e2-inch SAE threaded bottom connection\u003c\/strong\u003e for secure installation. \u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine \u003cstrong\u003eUnicel 8CH-951\u003c\/strong\u003e replacement filter\u003c\/li\u003e\n\u003cli\u003eDesigned for select \u003cstrong\u003eBullfrog Spas\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e40 sq. ft. filtration area\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e244 pleats\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003ePremium \u003cstrong\u003e3 oz. filter media\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eSemi-circular handle for easy removal\u003c\/li\u003e\n\u003cli\u003e2\" SAE threaded connection\u003c\/li\u003e\n\u003cli\u003eHelps maintain clean, clear spa water\u003c\/li\u003e\n\u003cli\u003eDesigned for excellent water flow and debris capture\u003c\/li\u003e\n\u003cli\u003eReplaces discontinued \u003cstrong\u003eUnicel 8CH-950\u003c\/strong\u003e \n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Unicel\u003cbr\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 8CH-951\u003cbr\u003e\u003cstrong\u003eFilter Area:\u003c\/strong\u003e 40 sq. ft.\u003cbr\u003e\u003cstrong\u003eOutside Diameter:\u003c\/strong\u003e 8\"\u003cbr\u003e\u003cstrong\u003eLength:\u003c\/strong\u003e 5-3\/4\"\u003cbr\u003e\u003cstrong\u003ePleat Count:\u003c\/strong\u003e 244\u003cbr\u003e\u003cstrong\u003eFilter Media:\u003c\/strong\u003e 3 oz.\u003cbr\u003e\u003cstrong\u003eTop:\u003c\/strong\u003e Semi-Circular Handle\u003cbr\u003e\u003cstrong\u003eBottom:\u003c\/strong\u003e 2\" SAE Thread\u003cbr\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Bullfrog Spas \u003c\/p\u003e\n\u003ch3\u003eReplacement \u0026amp; Cross-Reference Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnicel:\u003c\/strong\u003e 8CH-951\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces Unicel:\u003c\/strong\u003e 8CH-950\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBullfrog OEM:\u003c\/strong\u003e 10-2870 \n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilbur:\u003c\/strong\u003e FC-0536\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePleatco:\u003c\/strong\u003e PBF50-F2S F \n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Unicel notes that the 8CH-951 also replaces the older Bullfrog 6\" overall-length filter with the shorter threaded end. \u003c\/p\u003e\n\u003cp\u003eAlways compare your existing filter's dimensions and threaded connection before ordering.\u003c\/p\u003e\n\u003ch3\u003eWhy Buy From Red Rock Spas?\u003c\/h3\u003e\n\u003cp\u003eRed Rock Spas carries replacement hot tub filters, parts, water-care products and accessories from trusted manufacturers. If you're unsure whether the Unicel 8CH-951 fits your Bullfrog Spa, our team can help you identify the correct replacement filter.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/collections\/hot-tub-filters\"\u003eShop all hot tub and spa filters\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/how-often-to-clean-replace-spa-filter\"\u003eFilter cleaning and replacement guide\u003c\/a\u003e\u003c\/p\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":46340606361749,"sku":"42","price":64.18,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/2142\/2741\/files\/unicel-8ch-951-bullfrog-spa-filter-main.jpg?v=1788369110"},{"product_id":"unicel-c-7367-dimension-one-spa-filter","title":"Unicel C-7367 Dimension One Spa Filter – 75 Sq Ft | FC-3059 \u0026 PDO75-2000","description":"\u003ch2\u003eUnicel C-7367 Replacement Spa Filter Cartridge — 75 Sq. Ft.\u003c\/h2\u003e\n\u003cp\u003eThe Unicel C-7367 is a premium 75-square-foot replacement spa filter cartridge designed for select Dimension One Spas and @Home Hot Tubs. Its distinctive closed top with Y-shaped stand-offs and 2-inch open twist-lock bottom connection make it easy to identify as the correct Dimension One-style filter.\u003c\/p\u003e\n\u003cp\u003eThe 75-square-foot filtration area and 3 oz. filter media help capture dirt, body oils, debris, and other contaminants while maintaining proper water flow through your spa’s filtration system. Customers searching for Filbur FC-3059, Pleatco PDO75-2000, Dimension One OEM 1561-00, Darlly 70759, or Aladdin 17541 may find this to be the compatible replacement.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Unicel C-7367 replacement spa filter\u003c\/li\u003e\n\u003cli\u003e75 sq. ft. filtration area\u003c\/li\u003e\n\u003cli\u003e7-1\/8\" outside diameter\u003c\/li\u003e\n\u003cli\u003e10-1\/2\" length\u003c\/li\u003e\n\u003cli\u003e3 oz. filtration media\u003c\/li\u003e\n\u003cli\u003eClosed top with Y stand-offs\u003c\/li\u003e\n\u003cli\u003e2\" open twist-lock bottom connection\u003c\/li\u003e\n\u003cli\u003eDesigned for select Dimension One Spas\u003c\/li\u003e\n\u003cli\u003eUsed in select @Home Hot Tubs\u003c\/li\u003e\n\u003cli\u003eMade in USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Unicel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e C-7367\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Area:\u003c\/strong\u003e 75 sq. ft.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter:\u003c\/strong\u003e 7-1\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 10-1\/2\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Media:\u003c\/strong\u003e 3 oz.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTop:\u003c\/strong\u003e Closed with Y stand-offs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBottom:\u003c\/strong\u003e 2\" open twist-lock connection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCross-Reference \/ Replacement Part Numbers\u003c\/h3\u003e\n\u003cp\u003eCustomers searching for any of the following part numbers may find this to be a compatible replacement:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnicel:\u003c\/strong\u003e C-7367\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilbur:\u003c\/strong\u003e FC-3059\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePleatco:\u003c\/strong\u003e PDO75-2000\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimension One OEM:\u003c\/strong\u003e 1561-00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDarlly:\u003c\/strong\u003e 70759\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAladdin:\u003c\/strong\u003e 17541\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatibility \u0026amp; Fitment\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-7367 is designed for select\u003cstrong\u003e \u003c\/strong\u003eDimension One Spas and @Home Hot Tubs that use the twist-lock style filter configuration. This is not a threaded filter — it uses a 2-inch open twist-lock bottom connection.\u003c\/p\u003e\n\u003cp\u003eBefore ordering, please confirm your existing filter matches all of the following:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOutside diameter: 7-1\/8\"\u003c\/li\u003e\n\u003cli\u003eLength: 10-1\/2\"\u003c\/li\u003e\n\u003cli\u003eTop: Closed with Y stand-offs\u003c\/li\u003e\n\u003cli\u003eBottom: 2\" open twist-lock fitting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFitment can vary by spa model and production year. Always verify your existing filter’s part number before ordering.\u003c\/p\u003e\n\u003ch3\u003eWhy Buy From Red Rock Spas?\u003c\/h3\u003e\n\u003cp\u003eRed Rock Spas specializes in hot tubs, replacement spa filters, spa parts, accessories, and water-care products. If you’re unsure whether the Unicel C-7367 is the correct filter for your Dimension One Spa or @Home Hot Tub, our team can help you identify the right replacement — just reach out before ordering.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/collections\/hot-tub-filters\"\u003eShop all hot tub and spa filters\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/how-often-to-clean-replace-spa-filter\"\u003eFilter cleaning and replacement guide\u003c\/a\u003e\u003c\/p\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":46340612980885,"sku":null,"price":89.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/2142\/2741\/files\/unicel-c-7367-dimension-one-spa-filter-main.jpg?v=1788906204"},{"product_id":"unicel-c-8465-hot-spring-spa-filter","title":"Unicel C-8465 Hot Spring Spa Filter – 65 Sq Ft | FC-3960 \u0026 PWK65","description":"\u003ch2\u003eUnicel C-8465 Replacement Spa Filter Cartridge — 65 Sq. Ft.\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eUnicel C-8465\u003c\/strong\u003e is a premium \u003cstrong\u003e65-square-foot\u003c\/strong\u003e replacement spa filter cartridge designed for select \u003cstrong\u003eHot Spring Spas\u003c\/strong\u003e, \u003cstrong\u003eTiger River Spas\u003c\/strong\u003e, \u003cstrong\u003eWatkins Manufacturing\u003c\/strong\u003e spas, and certain \u003cstrong\u003eCaldera Spa\u003c\/strong\u003e applications. Unicel upgraded this cartridge from the original 45-square-foot design to 65 square feet of filtration area with 234 pleats, providing enhanced filtration performance while maintaining proper water flow through your spa system.\u003c\/p\u003e\n\n\u003cp\u003eIts 3 oz. filtration media helps capture dirt, body oils, debris, and other contaminants to keep your spa water clean and clear. Customers searching for Filbur \u003cstrong\u003eFC-3960\u003c\/strong\u003e, Pleatco \u003cstrong\u003ePWK65\u003c\/strong\u003e, Watkins\/Hot Spring OEM \u003cstrong\u003e31114\u003c\/strong\u003e, Hot Spring OEM \u003cstrong\u003e71827\u003c\/strong\u003e, Watkins OEM \u003cstrong\u003e71828\u003c\/strong\u003e, or Caldera OEM \u003cstrong\u003e76136\u003c\/strong\u003e may find this to be the compatible replacement.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eGenuine Unicel C-8465 replacement spa filter\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e65 sq. ft.\u003c\/strong\u003e filtration area — upgraded from the original 45 sq. ft. design\u003c\/li\u003e\n  \u003cli\u003e234 pleats for thorough water filtration\u003c\/li\u003e\n  \u003cli\u003e3 oz. filtration media\u003c\/li\u003e\n  \u003cli\u003e8-1\/2\" outside diameter\u003c\/li\u003e\n  \u003cli\u003e10-1\/2\" length\u003c\/li\u003e\n  \u003cli\u003e3\" open top\u003c\/li\u003e\n  \u003cli\u003e3\" open bottom\u003c\/li\u003e\n  \u003cli\u003eDesigned for select Hot Spring \/ Watkins spa applications\u003c\/li\u003e\n  \u003cli\u003eCross-references FC-3960 and PWK65\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Unicel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e C-8465\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFilter Area:\u003c\/strong\u003e 65 sq. ft.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutside Diameter:\u003c\/strong\u003e 8-1\/2\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 10-1\/2\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePleat Count:\u003c\/strong\u003e 234\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFilter Media:\u003c\/strong\u003e 3 oz. filtration media\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTop End:\u003c\/strong\u003e 3\" open\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBottom End:\u003c\/strong\u003e 3\" open\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCross-Reference \/ Replacement Part Numbers\u003c\/h3\u003e\n\u003cp\u003eCustomers searching for any of the following part numbers may find this to be a compatible replacement:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUnicel:\u003c\/strong\u003e C-8465\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFilbur:\u003c\/strong\u003e FC-3960\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePleatco:\u003c\/strong\u003e PWK65\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWatkins \/ Hot Spring OEM:\u003c\/strong\u003e 31114\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHot Spring OEM:\u003c\/strong\u003e 71827\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWatkins OEM:\u003c\/strong\u003e 71828\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCaldera OEM:\u003c\/strong\u003e 76136\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatibility \u0026amp; Fitment\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-8465 is used in select Watkins-family spas including Hot Spring Spas, Tiger River Spas, and certain Caldera Spa applications. Fitment varies by model and year.\u003c\/p\u003e\n\u003cp\u003eBefore ordering, please compare your existing filter’s part number and verify the following dimensions match:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOutside diameter: 8-1\/2\"\u003c\/li\u003e\n  \u003cli\u003eLength: 10-1\/2\"\u003c\/li\u003e\n  \u003cli\u003eTop end: 3\" open\u003c\/li\u003e\n  \u003cli\u003eBottom end: 3\" open\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e The current Unicel C-8465 replacement cartridge is rated at \u003cstrong\u003e65 sq. ft.\u003c\/strong\u003e and is an upgrade over the original 45 sq. ft. filter design.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Buy From Red Rock Spas?\u003c\/h3\u003e\n\u003cp\u003eRed Rock Spas specializes in hot tubs, replacement spa filters, spa parts, and water-care products. If you’re unsure whether the \u003cstrong\u003eUnicel C-8465\u003c\/strong\u003e is the correct filter for your spa, our team can help you identify the right replacement — just reach out before ordering.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/collections\/hot-tub-filters\"\u003eShop all hot tub and spa filters\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/how-often-to-clean-replace-spa-filter\"\u003eFilter cleaning and replacement guide\u003c\/a\u003e\u003c\/p\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":46340613570709,"sku":"120","price":94.68,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/2142\/2741\/files\/unicel-c-8465-hot-spring-spa-filter-main.jpg?v=1788383307"},{"product_id":"filter-7ch-322","title":"Unicel 7CH-322 Replacement Spa Filter Cartridge – 32 Sq. Ft.","description":"\u003cp\u003eMaintain crystal-clear water and peak spa performance with the \u003cstrong\u003eUnicel 7CH-322 Replacement Spa Filter Cartridge\u003c\/strong\u003e. Designed with \u003cstrong\u003e32 square feet of premium filtration media\u003c\/strong\u003e, this high-quality replacement filter captures dirt, oils, hair, and fine debris down to an average of \u003cstrong\u003e20 microns\u003c\/strong\u003e, helping keep your hot tub water clean and inviting.\u003c\/p\u003e\n\u003cp\u003eManufactured using \u003cstrong\u003e100% Reemay® polyester filter media\u003c\/strong\u003e, the 7CH-322 offers outstanding durability, excellent chemical resistance, and superior dirt-holding capacity. Its \u003cstrong\u003e175 precision pleats\u003c\/strong\u003e maximize filtration surface area while maintaining excellent water flow, reducing stress on your spa's pump and filtration system.\u003c\/p\u003e\n\u003cp\u003eFeaturing a \u003cstrong\u003e2-inch male threaded (MPT) connection\u003c\/strong\u003e and a convenient \u003cstrong\u003esemi-circular handle\u003c\/strong\u003e, this filter is quick and easy to install or remove for routine maintenance.\u003c\/p\u003e\n\u003cp\u003eWhether you're replacing a worn filter or keeping a spare on hand, the \u003cstrong\u003eUnicel 7CH-322\u003c\/strong\u003e delivers dependable performance and long-lasting filtration.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine \u003cstrong\u003eUnicel 7CH-322\u003c\/strong\u003e replacement spa filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e32 square feet\u003c\/strong\u003e of premium filtration media\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e175 precision pleats\u003c\/strong\u003e for maximum dirt-holding capacity\u003c\/li\u003e\n\u003cli\u003eFilters particles down to approximately \u003cstrong\u003e20 microns\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMade with \u003cstrong\u003e100% Reemay® polyester\u003c\/strong\u003e filter media\u003c\/li\u003e\n\u003cli\u003eExcellent chemical resistance and durability\u003c\/li\u003e\n\u003cli\u003eMaintains optimal water flow while capturing more debris\u003c\/li\u003e\n\u003cli\u003eEasy installation with \u003cstrong\u003e2-inch male threaded (MPT)\u003c\/strong\u003e connection\u003c\/li\u003e\n\u003cli\u003eSemi-circular top handle for quick removal\u003c\/li\u003e\n\u003cli\u003eHelps protect pumps, heaters, and other spa equipment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Unicel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e 7CH-322\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFiltration Area:\u003c\/strong\u003e 32 Square Feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter:\u003c\/strong\u003e 7 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTop End Cap:\u003c\/strong\u003e Semi-Circular Handle\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBottom Connection:\u003c\/strong\u003e 2-inch Male Thread (MPT)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePleat Count:\u003c\/strong\u003e 175\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Media:\u003c\/strong\u003e 100% Reemay® Polyester\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFiltration Rating:\u003c\/strong\u003e Approximately 20 Microns\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eCompatible With\u003c\/h2\u003e\n\u003cp\u003eThe Unicel 7CH-322 replacement filter is commonly used in select models from:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eColeman® Spas\u003c\/li\u003e\n\u003cli\u003eArtesian Spas®\u003c\/li\u003e\n\u003cli\u003eMaster Spas®\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eAlways compare your existing filter's dimensions and connection style before ordering to ensure proper fitment.\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eBenefits of Replacing Your Spa Filter\u003c\/h2\u003e\n\u003cp\u003eReplacing your spa filter regularly helps:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eKeep water crystal clear\u003c\/li\u003e\n\u003cli\u003eImprove filtration performance\u003c\/li\u003e\n\u003cli\u003eExtend the life of pumps and heaters\u003c\/li\u003e\n\u003cli\u003eReduce chemical consumption\u003c\/li\u003e\n\u003cli\u003eIncrease water circulation\u003c\/li\u003e\n\u003cli\u003eCreate a cleaner, healthier soaking experience\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor best results, rinse your filter every 2–4 weeks and replace it approximately every 12 months, depending on usage and water conditions.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eWhy Buy from Red Rock Spas?\u003c\/h2\u003e\n\u003cp\u003eAt \u003cstrong\u003eRed Rock Spas\u003c\/strong\u003e, we offer premium replacement spa filters, genuine hot tub parts, water care products, and expert customer support. Whether you own a Coleman, Artesian, Master Spa, Jacuzzi®, Sundance®, or another leading brand, we're here to help you find the right parts to keep your spa running like new.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/collections\/hot-tub-filters\"\u003eShop all hot tub and spa filters\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/how-often-to-clean-replace-spa-filter\"\u003eFilter cleaning and replacement guide\u003c\/a\u003e\u003c\/p\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":46340632182933,"sku":null,"price":49.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/2142\/2741\/files\/7CH-322side.avif?v=1785867151"},{"product_id":"filter-c-7350","title":"Unicel C-7350 Replacement Hot Tub \u0026 Spa Filter Cartridge","description":"\u003cp\u003eKeep your hot tub water clean, clear, and ready to enjoy with the \u003cstrong\u003eUnicel C-7350 Replacement Spa Filter Cartridge\u003c\/strong\u003e. Manufactured in the \u003cstrong\u003eUSA\u003c\/strong\u003e using premium filtration media, the C-7350 is engineered to meet or exceed OEM specifications, providing outstanding water clarity, efficient circulation, and dependable performance.\u003c\/p\u003e\n\u003cp\u003eDesigned to trap dirt, oils, body contaminants, and fine debris, this high-quality replacement filter helps protect your spa's pump, heater, and plumbing while reducing the amount of chemicals needed to maintain balanced water. Whether you're replacing an old filter or stocking a spare, the Unicel C-7350 is built for long-lasting durability and reliable filtration.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine \u003cstrong\u003eUnicel C-7350\u003c\/strong\u003e replacement filter cartridge\u003c\/li\u003e\n\u003cli\u003ePremium heavy-duty Reemay® filtration media\u003c\/li\u003e\n\u003cli\u003eManufactured in the \u003cstrong\u003eUSA\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMeets or exceeds OEM specifications\u003c\/li\u003e\n\u003cli\u003eHigh-efficiency filtration for cleaner, clearer water\u003c\/li\u003e\n\u003cli\u003eHelps extend the life of spa equipment\u003c\/li\u003e\n\u003cli\u003eEasy to install and replace\u003c\/li\u003e\n\u003cli\u003eDesigned for long-lasting performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Unicel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e C-7350\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Media:\u003c\/strong\u003e Premium Reemay® Polyester\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade In:\u003c\/strong\u003e USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cblockquote\u003e\n\u003cp\u003e\u003cstrong\u003ePlease verify your existing filter's dimensions and end cap style before ordering to ensure proper fitment.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\u003ch2\u003eBenefits of Replacing Your Spa Filter\u003c\/h2\u003e\n\u003cp\u003eA clean filter is essential for keeping your hot tub operating efficiently. Replacing your filter on a regular schedule helps:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMaintain crystal-clear water\u003c\/li\u003e\n\u003cli\u003eImprove water circulation\u003c\/li\u003e\n\u003cli\u003eCapture dirt, oils, and fine particles\u003c\/li\u003e\n\u003cli\u003eReduce strain on pumps and heaters\u003c\/li\u003e\n\u003cli\u003eImprove sanitizer efficiency\u003c\/li\u003e\n\u003cli\u003eExtend the life of your hot tub equipment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor best performance, rinse your filter every 2–4 weeks and replace it every 12 months, depending on usage and water conditions.\u003c\/p\u003e\n\u003ch2\u003eWhy Choose Unicel?\u003c\/h2\u003e\n\u003cp\u003eUnicel has been a trusted name in pool and spa filtration for decades. Their replacement filter cartridges are known for exceptional build quality, premium materials, and reliable performance, making them one of the most trusted aftermarket filter manufacturers in the industry.\u003c\/p\u003e\n\u003ch2\u003eWhy Buy from Red Rock Spas?\u003c\/h2\u003e\n\u003cp\u003eAt \u003cstrong\u003eRed Rock Spas\u003c\/strong\u003e, we carry premium replacement spa filters, genuine parts, water care products, and accessories backed by knowledgeable customer support. Whether you're maintaining a Jacuzzi®, Sundance®, Cal Spas®, Bullfrog®, or another major brand, we're here to help you find the right filter for your spa.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/collections\/hot-tub-filters\"\u003eShop all hot tub and spa filters\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/how-often-to-clean-replace-spa-filter\"\u003eFilter cleaning and replacement guide\u003c\/a\u003e\u003c\/p\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":46340633034901,"sku":null,"price":71.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/2142\/2741\/files\/C-7350filter.jpg?v=1785866440"},{"product_id":"unicel-c-7451-caldera-spa-filter","title":"Unicel C-7451 Caldera Spa Filter – 50 Sq Ft | FC-3084 \u0026 PCD50","description":"\u003ch2\u003eUnicel C-7451 Replacement Spa Filter Cartridge — 50 Sq. Ft.\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eUnicel C-7451\u003c\/strong\u003e is a premium 50-square-foot replacement filter cartridge designed for select \u003cstrong\u003eCaldera Spas\u003c\/strong\u003e that use this original-style filter configuration. Built with durable 3 oz. Reemay 2033 polyester filtration media and 200 pleats, it helps capture dirt, body oils, debris, and other contaminants while maintaining proper water flow through your spa’s filtration system.\u003c\/p\u003e\n\n\u003cp\u003eCustomers searching for Filbur \u003cstrong\u003eFC-3084\u003c\/strong\u003e, Pleatco \u003cstrong\u003ePCD50\u003c\/strong\u003e, Caldera OEM \u003cstrong\u003e33016 \/ 033016\u003c\/strong\u003e, Darlly \u003cstrong\u003e70511\u003c\/strong\u003e, or Aladdin \u003cstrong\u003e15034\u003c\/strong\u003e may find this to be the compatible replacement.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eGenuine Unicel C-7451 replacement spa filter\u003c\/li\u003e\n  \u003cli\u003e50 sq. ft. filtration area\u003c\/li\u003e\n  \u003cli\u003e200 pleats for thorough water filtration\u003c\/li\u003e\n  \u003cli\u003e3 oz. Reemay 2033 polyester filtration media\u003c\/li\u003e\n  \u003cli\u003e7\" outside diameter\u003c\/li\u003e\n  \u003cli\u003e10-3\/4\" length\u003c\/li\u003e\n  \u003cli\u003eSemi-circular top handle for easy, tool-free removal\u003c\/li\u003e\n  \u003cli\u003e2\" male slip fitting bottom connection\u003c\/li\u003e\n  \u003cli\u003eDesigned for select Caldera Spa filter applications\u003c\/li\u003e\n  \u003cli\u003eHelps maintain efficient spa water flow\u003c\/li\u003e\n  \u003cli\u003eMade in USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Unicel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e C-7451\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFilter Area:\u003c\/strong\u003e 50 sq. ft.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutside Diameter:\u003c\/strong\u003e 7\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 10-3\/4\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePleat Count:\u003c\/strong\u003e 200\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFilter Media:\u003c\/strong\u003e 3 oz. Reemay 2033 polyester\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTop:\u003c\/strong\u003e Semi-circular handle\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBottom:\u003c\/strong\u003e 2\" male slip fitting\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCross-Reference \/ Replacement Part Numbers\u003c\/h3\u003e\n\u003cp\u003eCustomers searching for any of the following part numbers may find this to be a compatible replacement:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUnicel:\u003c\/strong\u003e C-7451\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFilbur:\u003c\/strong\u003e FC-3084\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePleatco:\u003c\/strong\u003e PCD50\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCaldera OEM:\u003c\/strong\u003e 33016 | 033016\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDarlly:\u003c\/strong\u003e 70511\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAladdin:\u003c\/strong\u003e 15034\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatibility \u0026amp; Fitment\u003c\/h3\u003e\n\u003cp\u003eThe Unicel C-7451 is designed for select Caldera Spas using this original-style 50-square-foot filter configuration with a \u003cstrong\u003e2-inch male slip fitting\u003c\/strong\u003e on the bottom. This is not the newer open-bottom Caldera filter configuration.\u003c\/p\u003e\n\u003cp\u003eSpa manufacturers can change filter configurations between models and production years. Before ordering, please compare your existing filter’s part number, outside diameter (7\"), overall length (10-3\/4\"), handle style (semi-circular), and bottom connection (2\" male slip fitting) to confirm this is the correct replacement.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Buy From Red Rock Spas?\u003c\/h3\u003e\n\u003cp\u003eRed Rock Spas specializes in hot tubs, spa filters, replacement parts, and water-care products. If you’re unsure whether the \u003cstrong\u003eUnicel C-7451\u003c\/strong\u003e is the right filter for your Caldera Spa, our team can help you identify the correct replacement — just reach out before ordering.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/collections\/hot-tub-filters\"\u003eShop all hot tub and spa filters\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/how-often-to-clean-replace-spa-filter\"\u003eFilter cleaning and replacement guide\u003c\/a\u003e\u003c\/p\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":46340633100437,"sku":"41","price":69.72,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/2142\/2741\/files\/unicel-c-7451-caldera-spa-filter-main.jpg?v=1788382939"},{"product_id":"unicel-5ch-752-filter-75sq-ft","title":"Unicel 5CH-752 Spa Filter Cartridge – 75 Sq Ft","description":"\u003ch2\u003eUnicel 5CH-752 Spa Filter Cartridge – 75 Sq Ft Replacement Filter\u003c\/h2\u003e\n\u003cp\u003eThe Unicel 5CH-752 spa filter cartridge is a high-quality replacement hot tub filter designed to deliver efficient filtration, improved water clarity, and reliable performance for compatible hot tubs and spas. Built with durable Reemay filtration media and engineered to meet OEM specifications, this 75 square foot spa filter helps trap debris, oils, and contaminants to keep your spa water cleaner and healthier between maintenance cycles.\u003c\/p\u003e\n\u003cp\u003eDesigned for long-lasting performance and excellent flow characteristics, the Unicel 5CH-752 provides dependable filtration while helping extend the time between cleanings.\u003c\/p\u003e\n\u003ch3\u003eFeatures \u0026amp; Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHigh-efficiency 75 sq ft filtration area\u003c\/li\u003e\n\u003cli\u003eDurable 3-ounce Reemay filter media\u003c\/li\u003e\n\u003cli\u003eHelps improve spa water clarity\u003c\/li\u003e\n\u003cli\u003eCaptures dirt, debris, and fine particles\u003c\/li\u003e\n\u003cli\u003eLonger cleaning intervals\u003c\/li\u003e\n\u003cli\u003eBuilt to meet OEM specifications\u003c\/li\u003e\n\u003cli\u003eEasy installation and replacement\u003c\/li\u003e\n\u003cli\u003eDesigned for reliable water flow and circulation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eManufacturer: Unicel\u003c\/li\u003e\n\u003cli\u003ePart Number: 5CH-752\u003c\/li\u003e\n\u003cli\u003eFilter Area: 75 Square Feet\u003c\/li\u003e\n\u003cli\u003eDiameter: 5 3\/16 inches\u003c\/li\u003e\n\u003cli\u003eLength: 16 1\/8 inches\u003c\/li\u003e\n\u003cli\u003eTop End Cap: Bar Handle\u003c\/li\u003e\n\u003cli\u003eBottom End Cap: 2-inch Male Thread (MPT)\u003c\/li\u003e\n\u003cli\u003ePleat Count: 194\u003c\/li\u003e\n\u003cli\u003eFilter Media: 3-ounce Reemay 2033\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWater Care \u0026amp; Maintenance Tips\u003c\/h3\u003e\n\u003cp\u003eFor best performance, rinse your spa filter every 2–4 weeks depending on usage and water conditions. Regular filter cleaning helps improve water clarity, circulation, and overall spa performance. Replace filters approximately every 12 months or as needed based on usage and water chemistry.\u003c\/p\u003e\n\u003ch3\u003eWhy Buy From Red Rock Spas?\u003c\/h3\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" href=\"https:\/\/www.redrockspas.com\" target=\"_blank\"\u003eRed Rock Spas\u003c\/a\u003e is a real hot tub dealership and service company serving Utah and Nevada. Our technicians and spa professionals work with filters, water care, and spa systems every day, helping customers find the correct replacement parts with real-world experience and support.\u003c\/p\u003e\n\u003ch3\u003eNeed Help Finding the Correct Filter?\u003c\/h3\u003e\n\u003cp\u003eOur team can help verify compatibility and help you find the correct replacement spa filter for your hot tub or swim spa.\u003c\/p\u003e\u003cp\u003eBefore ordering, confirm your existing filter part number, dimensions and end-cap connections.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/collections\/unicel-hot-tub-spa-filters\"\u003eShop Unicel filters\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/how-often-to-clean-replace-spa-filter\"\u003eFilter care guide\u003c\/a\u003e\u003c\/p\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":46340686348437,"sku":null,"price":69.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/2142\/2741\/files\/812EseSG3cL._UF894_1000_QL80.jpg?v=1756854334"},{"product_id":"unicel-7ch-502-spa-filter-cartridge","title":"Unicel 7CH-502 Spa Filter Cartridge 50 Sq Ft","description":"\u003ch2\u003eUnicel 7CH-502 Spa Filter Cartridge\u003c\/h2\u003e\u003cp\u003eThe Unicel 7CH-502 replacement spa filter cartridge is designed to provide efficient filtration and improved water clarity for compatible hot tubs and spa systems.\u003c\/p\u003e\u003cp\u003eBuilt with durable 3-ounce Reemay filter media, this 50 square foot cartridge helps capture debris and contaminants while maintaining strong water flow and filtration performance.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGenuine Unicel replacement filter cartridge\u003c\/li\u003e\n\u003cli\u003e50 square feet of filter media\u003c\/li\u003e\n\u003cli\u003e3-ounce Reemay 2033 filter media\u003c\/li\u003e\n\u003cli\u003eDesigned for efficient filtration and water clarity\u003c\/li\u003e\n\u003cli\u003eLonger time between cleanings\u003c\/li\u003e\n\u003cli\u003eMeets OEM specifications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Unicel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 7CH-502\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Spa Filter Cartridge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Area:\u003c\/strong\u003e 50 Sq Ft\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter:\u003c\/strong\u003e 7 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 14 3\/4 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePleat Count:\u003c\/strong\u003e 144\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Media:\u003c\/strong\u003e 3 oz Reemay 2033\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eEnd Cap Details\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eTop End Cap:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSemi-circular handle\u003c\/li\u003e\n\u003cli\u003e0-inch inner diameter\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eBottom End Cap:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e2-inch male thread (MPT)\u003c\/li\u003e\n\u003cli\u003e0-inch inner diameter\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eBenefits\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eImproved water clarity\u003c\/li\u003e\n\u003cli\u003eHelps maintain proper water circulation\u003c\/li\u003e\n\u003cli\u003eCaptures dirt and debris efficiently\u003c\/li\u003e\n\u003cli\u003eDurable filter construction\u003c\/li\u003e\n\u003cli\u003eEasy replacement installation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eMaintenance Tips\u003c\/h3\u003e\u003cp\u003eFor best performance:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eRinse filters regularly\u003c\/li\u003e\n\u003cli\u003eDeep clean periodically\u003c\/li\u003e\n\u003cli\u003eReplace worn or damaged cartridges as needed\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eImportant Compatibility Note\u003c\/h3\u003e\u003cp\u003eVerify filter dimensions and end cap style before ordering.\u003c\/p\u003e\u003ch3\u003eWhy Buy From Red Rock Spas?\u003c\/h3\u003e\u003cp\u003eRed Rock Spas carries replacement spa filters, OEM spa parts, chemicals, and water care products for many hot tub brands.\u003c\/p\u003e\u003cp\u003eBefore ordering, confirm your existing filter part number, dimensions and end-cap connections.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/collections\/unicel-hot-tub-spa-filters\"\u003eShop Unicel filters\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/how-often-to-clean-replace-spa-filter\"\u003eFilter care guide\u003c\/a\u003e\u003c\/p\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":46340686381205,"sku":"7CH-502","price":83.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/2142\/2741\/files\/81W2qHiFnEL._AC_SL1500.jpg?v=1756925721"},{"product_id":"unicel-c-4975-spa-filter-cartridge","title":"Unicel C-4975 Spa Filter Cartridge 75 Sq Ft","description":"\u003ch2\u003eUnicel C-4975 Spa Filter Cartridge\u003c\/h2\u003e\u003cp\u003eThe Unicel C-4975 replacement spa filter cartridge is designed to provide efficient filtration and improved water clarity for compatible hot tubs and spa systems.\u003c\/p\u003e\u003cp\u003eBuilt with durable 3-ounce Reemay 2033 filter media, this 75 square foot cartridge helps capture debris and contaminants while maintaining strong water flow and filtration performance.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGenuine Unicel replacement filter cartridge\u003c\/li\u003e\n\u003cli\u003e75 square feet of filter media\u003c\/li\u003e\n\u003cli\u003e3-ounce Reemay 2033 filter media\u003c\/li\u003e\n\u003cli\u003eDesigned for efficient filtration and water clarity\u003c\/li\u003e\n\u003cli\u003eLonger time between cleanings\u003c\/li\u003e\n\u003cli\u003eMeets OEM specifications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Unicel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e C-4975\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Spa Filter Cartridge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Area:\u003c\/strong\u003e 75 Sq Ft\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter:\u003c\/strong\u003e 4 15\/16 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 20 1\/8 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePleat Count:\u003c\/strong\u003e 210\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Media:\u003c\/strong\u003e 3 oz Reemay 2033\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eEnd Cap Details\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eTop End Cap:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eOpen\u003c\/li\u003e\n\u003cli\u003e2 1\/8-inch inner diameter\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eBottom End Cap:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eOpen\u003c\/li\u003e\n\u003cli\u003e2 1\/8-inch inner diameter\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatibility Note\u003c\/h3\u003e\u003cp\u003eThis filter fits self-cleaning Platinum Hydropool hot tubs and swim spas. Verify filter dimensions and end cap style before ordering.\u003c\/p\u003e\u003ch3\u003eBenefits\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eImproved water clarity\u003c\/li\u003e\n\u003cli\u003eHelps maintain proper water circulation\u003c\/li\u003e\n\u003cli\u003eCaptures dirt and debris efficiently\u003c\/li\u003e\n\u003cli\u003eDurable filter construction\u003c\/li\u003e\n\u003cli\u003eEasy replacement installation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eMaintenance Tips\u003c\/h3\u003e\u003cp\u003eFor best performance:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eRinse filters regularly\u003c\/li\u003e\n\u003cli\u003eDeep clean periodically\u003c\/li\u003e\n\u003cli\u003eReplace worn or damaged cartridges as needed\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhy Buy From Red Rock Spas?\u003c\/h3\u003e\u003cp\u003eRed Rock Spas carries replacement spa filters, OEM spa parts, chemicals, and water care products for many hot tub brands.\u003c\/p\u003e\u003cp\u003eBefore ordering, confirm your existing filter part number, dimensions and end-cap connections.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/collections\/unicel-hot-tub-spa-filters\"\u003eShop Unicel filters\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/how-often-to-clean-replace-spa-filter\"\u003eFilter care guide\u003c\/a\u003e\u003c\/p\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":46340686413973,"sku":"C-4975","price":70.24,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/2142\/2741\/files\/C-4975-1_960x720_cbf07272-ccfa-4851-8a4b-5e4047698b25.webp?v=1756925196"},{"product_id":"unicel-c-5601-25sq-ft-filter","title":"Unicel C-5601 Spa Filter Cartridge – 25 Sq Ft","description":"\u003cul\u003e\n\u003cli\u003eC-5601\u003c\/li\u003e\n\u003cli\u003eDiameter: 5 11\/16-inch; length: 10 3\/8-inch\u003c\/li\u003e\n\u003cli\u003eTop end cap: closed with string loop, 0-inch inner diameter; bottom end cap: open, 2-1\/8-inch inner diameter\u003c\/li\u003e\n\u003cli\u003ePleat count: 100; filter media: 3-ounce reemay 2033; filter area: 25 square feet\u003c\/li\u003e\n\u003cli\u003eGet more efficient filtration and better water clarity with Unicel filters\u003c\/li\u003e\n\u003cli\u003eLonger time between cleanings; meets oem specifications\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eBefore ordering, confirm your existing filter part number, dimensions and end-cap connections.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/collections\/unicel-hot-tub-spa-filters\"\u003eShop Unicel filters\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/how-often-to-clean-replace-spa-filter\"\u003eFilter care guide\u003c\/a\u003e\u003c\/p\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":46340686446741,"sku":null,"price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/2142\/2741\/files\/71nBl05nNAL._AC_UL320.jpg?v=1756854119"},{"product_id":"unicel-c-7466-filter","title":"Unicel C-7466 Spa Filter Cartridge – 65 Sq Ft","description":"\u003cul\u003e\n\u003cli\u003eUnicel C-7466\u003c\/li\u003e\n\u003cli\u003eDiameter: 7 1\/2-inch; length: 14 3\/4-inch\u003c\/li\u003e\n\u003cli\u003eTop end cap: castle, 0-inch inner diameter; bottom end cap: open, 2 5\/8-inch inner diameter\u003c\/li\u003e\n\u003cli\u003ePleat count: 164; filter media: 3-ounce reemay 2033; filter area: 65 square feet\u003c\/li\u003e\n\u003cli\u003eGet more efficient filtration and better water clarity with Unicel filters\u003c\/li\u003e\n\u003cli\u003eLonger time between cleanings; meets oem specifications\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eBefore ordering, confirm your existing filter part number, dimensions and end-cap connections.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/collections\/unicel-hot-tub-spa-filters\"\u003eShop Unicel filters\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/how-often-to-clean-replace-spa-filter\"\u003eFilter care guide\u003c\/a\u003e\u003c\/p\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":46340686512277,"sku":null,"price":89.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/2142\/2741\/files\/C7466_800x_ef0662ad-0684-4f9e-8df9-28d27bb2b0f7.webp?v=1756853811"},{"product_id":"unicel-c-7479-filter","title":"Unicel C-7479 Filter","description":"\u003cp\u003eUnicel C-7479 \u003c\/p\u003e\n\u003cul class=\"a-unordered-list a-vertical a-spacing-mini\"\u003e\n\u003cli class=\"a-spacing-mini\"\u003e\u003cspan class=\"a-list-item\"\u003eLength: 14 13\/16\", Width: 5 5\/16\"\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"a-spacing-mini\"\u003e\u003cspan class=\"a-list-item\"\u003eTop End Cap Style: open, Top End Cap Inner Diameter: 2 1\/8\"\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"a-spacing-mini\"\u003e\u003cspan class=\"a-list-item\"\u003eBottom End Cap Style: open, Bottom End Cap Inner Diameter: 2 1\/8\"\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"a-spacing-mini\"\u003e\u003cspan class=\"a-list-item\"\u003ePleat Count: 223, Square Ft.: 65\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"a-spacing-mini\"\u003e\u003cspan class=\"a-list-item\"\u003eUsed in Caldera spas as well as others. \u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":46340686545045,"sku":"201","price":87.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/2142\/2741\/files\/s-l1600.webp?v=1756246141"},{"product_id":"unicel-filter-c-5374-65-sqft","title":"Unicel C-5374 Spa Filter Cartridge – 65 Sq Ft","description":"\u003cul\u003e\n\u003cli\u003eC-5374\u003c\/li\u003e\n\u003cli\u003eLength: 14 13\/16\", Width: 5 5\/16\"\u003c\/li\u003e\n\u003cli\u003eTop End Cap Style: open, Top End Cap Inner Diameter: 2 1\/8\"\u003c\/li\u003e\n\u003cli\u003eBottom End Cap Style: open, Bottom End Cap Inner Diameter: 2 1\/8\"\u003c\/li\u003e\n\u003cli\u003ePleat Count: 223, Square Ft.: 65\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eBefore ordering, confirm your existing filter part number, dimensions and end-cap connections.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/collections\/unicel-hot-tub-spa-filters\"\u003eShop Unicel filters\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/how-often-to-clean-replace-spa-filter\"\u003eFilter care guide\u003c\/a\u003e\u003c\/p\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":46340686577813,"sku":null,"price":64.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/2142\/2741\/files\/41HMPAARUlL._AC.jpg?v=1756245782"},{"product_id":"unicel-filter-c-8450","title":"Unicel C-8450 Spa Filter Cartridge – 50 Sq Ft | Coleman \/ MAAX","description":"\u003cp\u003eThe genuine Unicel C-8450 is a 50 sq ft replacement cartridge for select Coleman and MAAX spas. It has an 8-inch outside diameter, a 9-inch length, an open top, and a 2-inch male slip fitting at the bottom. Compare these measurements and end caps with your old filter before ordering; spa brand alone does not confirm fit.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e Unicel C-8450\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter area:\u003c\/strong\u003e 50 sq ft\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 8-inch outside diameter × 9-inch length\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTop:\u003c\/strong\u003e 2-1\/16-inch opening\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBottom:\u003c\/strong\u003e 2-inch male slip fitting\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReference OEM numbers:\u003c\/strong\u003e Coleman \/ MAAX 100593 and 3301-2261\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e One cartridge\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you are unsure of the fit, send Red Rock Spas a photo of your old filter and its end caps along with your spa model. We can help you compare them before ordering.\u003c\/p\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":46340686610581,"sku":"1240","price":88.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/2142\/2741\/files\/ChatGPTImageSep23_2026_12_13_31PM.png?v=1790187228"}],"url":"https:\/\/shopredrockspas.com\/collections\/unicel-hot-tub-spa-filters.oembed","provider":"Red Rock Spas","version":"1.0","type":"link"}