The Unicel C-5621 filter cartridge has a closed top with a string and a hole on the bottom thats 1-15/16 inch. For optimal fit and performance, verify that this filter cartridge matches the dimensions of the old filter in your spa.
Filter details:
- Unicel P/N: C-5621
- Diameter: 5-3/16"
- Length: 11-7/8"
- Top: Closed with string handle
- Bottom: 1-15/16" Open
- Media: 22 sq.ft.
- Filter Media: 30z Reemay
- Pleat count: 106
Compatible replacement for:
- Filbur FC-3091
- Pentair R173469
- 17-175-1003
- APCC7084
How long should Unicel pool and 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 18 months or more, depending on your level of hot tub use and filter cleaning routine.
