The Unicel 5CH-37 hot tub filter cartridge has been used by Aquaterra Spas is select models as well as Watkins for select Hot Springs Spas models that use the OEM 303279 filter. Watkins and Aquaterra have used different-size filters for some of their spas models over time; therefore, it’s best to confirm that this filter is the same size as the existing cartridge in your hot tub model before ordering to ensure proper fitment.
Filter details:
- Part no: 5CH-37
- Diameter: 5-5/16"
- Length: 9"
- Top: Handle
- Bottom: 1-1/2" MPT Thread
- Media 37.5 sq.ft.
- Filter Media: 3oz
- Pleat count: 221
Also compatible replacement for:
- Watkins 303279
- Pleatco PFF42TC-P4
- ProAqua PA-537
- Filbur FC-2402
How long should Unicel hot tub filters last?
While most hot tub filters need to be changed every six to twelve months, Unicel brand filters are made with REEMAY premium trilobal filtration media that delivers 45% more surface area over standard rounded filter fibres and can last up to two years or more, depending on your level of use and cleaning routine.
