25 sq. ft.
If you want to use less chemicals and never have to clean a filter, you can also replace with the PF-170 PuraSPA Disposable Filter.
C-4625 replaces: Filbur FC-2370 UPC 64554402370. Pleatco PRB25-IN-4 UPC 090164250106. OEM 17-2325. Unicel UPC 678285140515.
Commonly used in: Alps Spas, Aries Spas, Haughs, Heldor Spas, Hydro Pool Industries, J.E.M Spas, Pentair Pool Products - Rainbow Plastics, Sequoia Design, Warm Springs Spa and others.