Emerald Spas hot tub filters
The Unicel 2026 Replacement Guide lists 5 of the cartridges on this site for Emerald 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 | Emerald Spas OEM # | Source |
|---|---|---|---|---|---|
| PJ25-IN-4 / C-5625 / FC-1425 | 5" x 13-1/4" | 25 | not specified | not listed | Unicel p.35 |
| PRB25-IN / C-4326 / FC-2375 | 5" x 13-5/16" | 25 | not specified | not listed | Unicel p.35 |
| PRB35-IN / C-4335 / FC-2385 | 5" x 9-1/4" | 35 | not specified | not listed | Unicel p.35 |
| PRB50-IN / C-4950 / FC-2390 | 5" x 13-5/16" | 50 | not specified | not listed | Unicel p.35 |
| PRB75 / C-4975 / FC-2395 | 5" x 20-1/8" | 75 | not specified | not listed | Unicel p.35 |
If your Emerald 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.