Hot Springs Spas hot tub filters
The Unicel 2026 Replacement Guide lists 4 of the cartridges on this site for Hot Springs Spas. Many tubs use only one of these, so measure your old filter or check the number printed on its end cap.
| Cartridge (Pleatco / Unicel / Filbur) | Diameter × length | Sq ft | Models | Hot Springs Spas OEM # | Source |
|---|---|---|---|---|---|
| PRB25-IN / C-4326 / FC-2375 | 5" x 13-5/16" | 25 | not specified | 33521 | Unicel p.39 |
| PWK30 / C-6330 / FC-3915 | 5-7/8" x 10-1/2" | 30 | not specified | 31489, 71825, 71826 | Unicel p.39 |
| PFF42TC-P4 / 5CH-37 / FC-2402 | 5-1/4" x 9-3/8" | 42 | not specified | 303279 | Unicel p.39 |
| PWK65 / C-8465 / FC-3960 | 8-1/2" x 10-1/2" | 65 | not specified | 31114, 71827, 71828 | Unicel p.39 |
If your Hot Springs Spas filter isn't here, it may not be in our checked list yet. We only publish matches we can confirm in a manufacturer catalog.