Martec hot tub filters
The Unicel 2026 Replacement Guide lists 1 of the cartridges on this site for Martec. 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 | Martec OEM # | Source |
|---|---|---|---|---|---|
| PMT50 / C-4305 / FC-1630 / FC-1617 | 5" x 14-3/4" | 50 | not specified | CL-2807 | Unicel p.44 |
If your Martec filter isn't here, it may not be in our checked list yet. We only publish matches we can confirm in a manufacturer catalog.