Pentair Pool Prod - Rainbow Plastics hot tub filters
The Unicel 2026 Replacement Guide lists 5 of the cartridges on this site for Pentair Pool Prod - Rainbow 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 | Pentair Pool Prod - Rainbow Plastics OEM # | Source |
|---|---|---|---|---|---|
| PRB25-IN / C-4326 / FC-2375 | 5" x 13-5/16" | 25 | Dynamic Series IV - DFM,DFML, Dynamic Series I - Model RDC, Dynamic Series II & III - RTL/RCF | 17-2327 | Unicel p.52 |
| PRB35-IN / C-4335 / FC-2385 | 5" x 9-1/4" | 35 | Dynamic Series IV - DFM,DFML | 17-2482 | Unicel p.52 |
| PRB50-IN / C-4950 / FC-2390 | 5" x 13-5/16" | 50 | Dynamic Series IV - DFM,DFML, Dynamic Series II & III - RTL/RCF, Dynamic Series I - Model RDC | 17-2380 | Unicel p.52 |
| PRB75 / C-4975 / FC-2395 | 5" x 20-1/8" | 75 | Dynamic Series II & III - RTL/RCF, Dynamic Series V - DSC-75 | 17-2632 | Unicel p.52 |
| PLBS100 / C-5397 / FC-2972 | 5-5/16" x 17-3/4" | 100 | not specified | R173601 | Unicel p.53 |
If your Pentair Pool Prod - Rainbow 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.