Master Spas hot tub filters
The Unicel 2026 Replacement Guide lists 5 of the cartridges on this site for Master 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 | Master Spas OEM # | Source |
|---|---|---|---|---|---|
| PAS35-F2M / 7CH-322 / FC-0419 / FC-0420 | 7-1/8" x 7-9/16" | 35 | not specified | not listed | Unicel p.45 |
| PWW35L / 4CH-935 | 5" x 8-1/2" | 35 | not specified | not listed | Unicel p.45 |
| PMA45-2004-R / C-8341 / FC-1007 | 8-1/4" x 6-7/8" | 45 | Micro Filter | not listed | Unicel p.45 |
| PWW50L / 4CH-949 / FC-0172 | 5" x 13-3/16" | 50 | not specified | not listed | Unicel p.45 |
| PWW50P3 / 6CH-940 / FC-0359 | 6" x 7-5/8" | 50 | not specified | not listed | Unicel p.45 |
If your Master 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.