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X268521 spa filter equivalents
Part number X268521 appears in 1 cross-reference row below. Each row lists the OEM, Unicel and Pleatco numbers that the source documents treat as interchangeable, plus the cartridge size so you can confirm against your old filter.
The same numbers, on one page, are in the cross-reference lookup. A schedule for this part number, and the buy link, are on the replacement schedule and reorder page. Published intervals by brand are in the replace and clean calculator.
Master Spas 4CH-252 cartridge (OEM X268521), 4-5/8" (117 mm) × 8" (203 mm), 25 sq ft. Unicel 4CH-252, Pleatco PMA20-F2M.
Pleatco PMA20-F2M
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| OEM | X268521 |
|---|---|
| Unicel | 4CH-252 |
| Pleatco | PMA20-F2M |
| Filbur | not listed |
| Size | 4-5/8" (117 mm) × 8" (203 mm), 25 sq ft |
Sources
- Unicel 2026 Replacement Guide: OEM cross reference (Master Spas section), PDF p.45 (printed p.41); spec table PDF p.7 (printed p.3) (PDF)
- Pleatco 2023 Catalog: Unicel-to-Pleatco cross reference, PDF p.47 (PDF)
Not in sources: no Filbur equivalent found in Filbur catalog.
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