Seven Seas hot tub filters
The Unicel 2026 Replacement Guide lists 2 of the cartridges on this site for Seven Seas. 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 | Seven Seas OEM # | Source |
|---|---|---|---|---|---|
| PJ25-IN-4 / C-5625 / FC-1425 | 5" x 13-1/4" | 25 | not specified | not listed | Unicel p.55 |
| PJW50 / C-5300 / FC-1320 | 5-11/16" x 10-3/8" | 50 | not specified | not listed | Unicel p.55 |
If your Seven Seas filter isn't here, it may not be in our checked list yet. We only publish matches we can confirm in a manufacturer catalog.