Gatsby Spas hot tub filters
The Unicel 2026 Replacement Guide lists 3 of the cartridges on this site for Gatsby 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 | Gatsby Spas OEM # | Source |
|---|---|---|---|---|---|
| PGS25P4 / 4CH-24 / FC-0131 | 4-5/8" x 9-3/4" | 25 | not specified | not listed | Unicel p.36 |
| PTL47W-P4 / 6CH-47 / FC-0315 | 6" x 8-1/2" | 47 | not specified | not listed | Unicel p.36 |
| PRB50-IN / C-4950 / FC-2390 | 5" x 13-5/16" | 50 | not specified | not listed | Unicel p.36 |
If your Gatsby 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.