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Caldera spa filters
9 Caldera replacement cartridges from the Unicel 2026 Replacement Guide and Pleatco 2023 catalog. Model-year fitment is not published in these sources, so find your cartridge by its OEM part number (printed on the end cap) or by measuring it.
| OEM | Unicel | Pleatco | Size | Status |
|---|---|---|---|---|
| 74148 | C-4335 | PRB35-IN | 4-15/16" × 9-1/4" | cited |
| 302005; 73533; 76076 | C-4950 | PRB50-IN | 4-15/16" × 13-5/16" | unverified |
| 1019401; 73532 | C-7350 | PCD50N | 7" × 10-3/4" | cited |
| 1019301; 73531 | C-7375 | PCD75N | 7" × 14-3/4" | cited |
| 033016 | C-7451 | PCD50 | 7" × 10-3/4" | cited |
| 033017 | C-7479 | PCD75 | 7" × 14-3/4" | cited |
| 74817 | C-8300 | — | 8" × 16-1/2" | unverified |
| 1039607; 73722 | C-8399 | PCD100W | 8" × 16-1/2" | cited |
| 76136 | C-8465 | PWK65 | 8-1/2" × 10-1/2" | cited |