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20045 spa filter equivalents
Part number 20045 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.
Marquis Spas C-5423 cartridge (OEM 20045), 5-3/16" (132 mm) × 11-15/16" (303 mm), 35 sq ft. Unicel C-5423, Pleatco PPM35TC.
Unicel C-5423
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| OEM | 20045 |
|---|---|
| Unicel | C-5423 |
| Pleatco | PPM35TC |
| Filbur | FC-3623 |
| Size | 5-3/16" (132 mm) × 11-15/16" (303 mm), 35 sq ft |
Sources
- Unicel 2026 Replacement Guide: OEM cross reference (Marquis Spas section), PDF p.44 (printed p.40); spec table PDF p.10 (printed p.6) (PDF)
- Filbur Catalog & Reference Guide: Product by Pool/Spa Manufacturer (OEM), Marquis Spas, printed p.42 (PDF p.22) (PDF)
- Marquis Spas (manufacturer filter finder): Filter Finder (series, model years, slip-on/threaded, sq ft, part number): Signature Series pre-1997, slip-on 35, 20045 (web page)
Not in sources: Unicel notes the original 20045 was a 25 sq ft cartridge, while Marquis's finder calls it 35 sq ft.
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