Unicel 5CH-37 Aquaterra Spa Filter – 37.5 Sq Ft | 303279

Unicel 5CH-37 Replacement Spa Filter Cartridge

Keep your hot tub water clean and clear with the Unicel 5CH-37 replacement spa filter cartridge. Designed as a replacement filter for select Aquaterra, Freeflow, Watkins and other compatible spas, the 5CH-37 provides 37.5 square feet of premium filtration area.

The Unicel 5CH-37 uses durable 3 oz. filtration media with 221 pleats 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.

This cartridge is an excellent replacement for customers searching by Watkins 303279, 78460, Filbur FC-2402 or Pleatco PFF42TC-P4.

Key Features

• Genuine Unicel 5CH-37 replacement spa filter
• 37.5 sq. ft. filtration area
• 221 pleats
• Premium 3 oz. filter media
• 5-5/16" outside diameter
• 9" cartridge length
• Top handle for easy removal
• 1-1/2" male threaded / MPT bottom
• Designed for excellent dirt capture and water flow
• Made in the USA

Specifications

Manufacturer: Unicel
Part Number: 5CH-37
Filter Area: 37.5 sq. ft.
Outside Diameter: 5-5/16"
Length: 9"
Pleat Count: 221
Filter Media: 3 oz. polyester
Top: Handle
Bottom: 1-1/2" Male Thread / MPT
Application: Aquaterra and compatible spa filtration systems

Cross References

• Unicel: 5CH-37
• Watkins / Aquaterra: 303279
• Watkins / Freeflow: 78460
• Filbur: FC-2402
• Pleatco: PFF42TC-P4
• Darlly: 50406
• Pure N Clean: PC-2402
• Spa Daddy: SD-01322
• Watkins: ACT-50SQFLTR
• Watkins: LSX1057

Compatible Spa Brands

The 5CH-37 and its equivalent cartridges are commonly used in select:

• Aquaterra Spas
• Freeflow Spas
• Fantasy Spas
• Lifesmart Spas
• Watkins-manufactured spas

Compatibility varies by model and year. Always verify your existing filter's part number, dimensions and 1-1/2" threaded connection before ordering.

Why Buy From Red Rock Spas?

Red 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.