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4CH-19 spa filter equivalents
Part number 4CH-19 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.
Cal Spas 4CH-19 cartridge (OEM FIL11100305), 4-5/8" (117 mm) × 4-5/8" (117 mm), 13 sq ft. Unicel 4CH-19, Pleatco PSG13.5P4.
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| OEM | FIL11100305 |
|---|---|
| Unicel | 4CH-19 |
| Pleatco | PSG13.5P4 |
| Filbur | FC-0122 |
| Size | 4-5/8" (117 mm) × 4-5/8" (117 mm), 13 sq ft |
Sources
- Unicel 2026 Replacement Guide: OEM cross reference (Cal Spas section), PDF p.30 (printed p.26); spec table PDF p.6 (printed p.2) (PDF)
- Pleatco 2023 Catalog: Unicel-to-Pleatco cross reference, PDF p.47 (PDF)
- Filbur Catalog & Reference Guide: Unicel-to-Filbur reverse cross reference, printed p.65 (PDF p.33) (PDF)
Not in sources: no model/model-year fitment in sources.
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