Waterway Plastics hot tub filters
The Unicel 2026 Replacement Guide lists 12 of the cartridges on this site for Waterway Plastics. 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 | Waterway Plastics OEM # | Source |
|---|---|---|---|---|---|
| PWW10 / C-4310 / FC-3077 | 4-1/4" x 4" | 10 | Skim filter 10 sq.ft. | 817-0010 | Unicel p.64 |
| PRB25-IN / C-4326 / FC-2375 | 5" x 13-5/16" | 25 | Top load (in-line) 25 sq.ft., TWM Cartridge Filter Pack | 817-2500, M-4326 | Unicel p.64 |
| PWW25L / 4CH-926 | 5" x 13-3/16" | 25 | Teleweir Skim Filter | 817-4025 | Unicel p.64 |
| PRB35-IN / C-4335 / FC-2385 | 5" x 9-1/4" | 35 | Top load (in-line) 35 sq.ft. | 817-3501 | Unicel p.64 |
| PWW35L / 4CH-935 | 5" x 8-1/2" | 35 | Teleweir Skim Filter | 817-4035 | Unicel p.64 |
| PLBS50 / C-5345 / FC-2970 | 5-5/16" x 10-1/8" | 50 | 45 sq.ft. top load | 817-0014 | Unicel p.64 |
| PRB50-IN / C-4950 / FC-2390 | 5" x 13-5/16" | 50 | TWM Cartridge Filter Pack, Top load (in-line) 50 sq.ft. | 817-5000 | Unicel p.64 |
| PWW50L / 4CH-949 / FC-0172 | 5" x 13-3/16" | 50 | Teleweir Skim Filter | 817-4050 | Unicel p.64 |
| PWW50P3 / 6CH-940 / FC-0359 | 6" x 7-5/8" | 50 | Front Access Skim Filter | 817-0050 | Unicel p.64 |
| PLBS75 / C-5374 / FC-2971 | 5-5/16" x 14-3/4" | 75 | 75 sq.ft. top load | 817-0015 | Unicel p.64 |
| PCAL100 / C-4995 / FC-2940 | 5" x 23-5/8" | 100 | Top load (in-line) 95 sq.ft. | 817-1000 | Unicel p.64 |
| PLBS100 / C-5397 / FC-2972 | 5-5/16" x 17-3/4" | 100 | 100 sq.ft. top load | 817-0016 | Unicel p.64 |
If your Waterway Plastics filter isn't here, it may not be in our checked list yet. We only publish matches we can confirm in a manufacturer catalog.