US Tooling & Spa hot tub filters
The Unicel 2026 Replacement Guide lists 2 of the cartridges on this site for US Tooling & Spa. 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 | US Tooling & Spa OEM # | Source |
|---|---|---|---|---|---|
| PWW10 / C-4310 / FC-3077 | 4-1/4" x 4" | 10 | not specified | not listed | Unicel p.62 |
| PRB50-IN / C-4950 / FC-2390 | 5" x 13-5/16" | 50 | not specified | not listed | Unicel p.62 |
If your US Tooling & Spa filter isn't here, it may not be in our checked list yet. We only publish matches we can confirm in a manufacturer catalog.