Imperial Spas hot tub filters
The Unicel 2026 Replacement Guide lists 1 of the cartridges on this site for Imperial 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 | Imperial Spas OEM # | Source |
|---|---|---|---|---|---|
| PGS25P4 / 4CH-24 / FC-0131 | 4-5/8" x 9-3/4" | 25 | not specified | not listed | Unicel p.40 |
If your Imperial 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.