Softub hot tub filters
The Unicel 2026 Replacement Guide lists 1 of the cartridges on this site for Softub. 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 | Softub OEM # | Source |
|---|---|---|---|---|---|
| PTL20W-SV-P4 / 6CH-25 / FC-0305 | 6" x 5-1/2" | 20 | not specified | 90-802 | Unicel p.55 |
If your Softub filter isn't here, it may not be in our checked list yet. We only publish matches we can confirm in a manufacturer catalog.