QCA hot tub filters
The Unicel 2026 Replacement Guide lists 4 of the cartridges on this site for QCA. 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 | QCA OEM # | Source |
|---|---|---|---|---|---|
| PRB25-IN / C-4326 / FC-2375 | 5" x 13-5/16" | 25 | not specified | not listed | Unicel p.53 |
| PRB50-IN / C-4950 / FC-2390 | 5" x 13-5/16" | 50 | not specified | not listed | Unicel p.53 |
| PCAL100 / C-4995 / FC-2940 | 5" x 23-5/8" | 100 | not specified | not listed | Unicel p.53 |
| PLBS100 / C-5397 / FC-2972 | 5-5/16" x 17-3/4" | 100 | not specified | not listed | Unicel p.53 |
If your QCA filter isn't here, it may not be in our checked list yet. We only publish matches we can confirm in a manufacturer catalog.