Replace the non-threaded cartridge filter in select Hydropool Serenity hot tubs with the Pleatco X18-PHY25. This round, pleated cartridge has a blue end cap with a handle and a push-on bottom opening. It corresponds to Hydropool replacement part 4520036.
Sold individually: Compatible Serenity spas use two filters; order two for a complete replacement.
Fit: Approximately 6-inch diameter, closed handle on top, and approximately 3¼-inch bottom opening. Compare the end caps and connection to your current filter before ordering.
Wave filter conversion: When replacing the earlier Serenity Wave filter (4520035), Hydropool adapter 5005045 is required. Some spas already have the adapter installed. Adapter is not included.
Connection: Non-threaded, push-on style. This filter does not fit threaded filter housings.
Not sure which Serenity filter your spa takes? Contact Red Rock Spas with a photo of your current filter and the spa model and year, and we can help check the fit.
