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Hot Spot spa filters
1 Hot Spot 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 |
|---|---|---|---|---|
| 33521 | C-4326 | PRB25-IN | 4-15/16" × 13-5/16" | cited |