Freeflow Spas hot tub filters
The Unicel 2026 Replacement Guide lists 1 of the cartridges on this site for Freeflow 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 | Freeflow Spas OEM # | Source |
|---|---|---|---|---|---|
| PFF25TC-P4 / 4CH-23 / FC-2400 | 4-5/8" x 6-5/8" | 25 | CLX | not listed | Unicel p.35 |
If your Freeflow 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.