Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.
Marquis Spas spa filter (C-5626)
Marquis Spas (listed as Pacific Marquis in the Filbur catalog)
Replacement numbers
Unicel C-5626, Pleatco PPM25-4
Fits Marquis Spas (listed as Pacific Marquis in the Filbur catalog).
Diameter 5-3/16" (132 mm)Length 11-7/8" (302 mm)25 sq ftUnicel C-5626
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| Unicel | C-5626 |
|---|---|
| Pleatco | PPM25-4 (as printed in the Filbur catalog Marquis Spas section (printed p.43); not found in the Pleatco 2023 Unicel cross reference) |
| Filbur | FC-3626 |
| Top | 1-1/16" (27 mm) / open |
| Bottom | 1-5/8" (41 mm) / open |
Bottom: 1-5/8" (41 mm) / open
Drawn to scale from the listed diameter and length and open-end sizes. Handles, threads and closed ends are drawn as symbols, not to scale. 25 sq ft media.
For Marquis Spas, C-5626 cartridge sits in Marquis Spas (listed as Pacific Marquis in the Filbur catalog). The cross-reference prints Unicel C-5626; Pleatco PPM25-4; Filbur FC-3626. 5-3/16" across, 11-7/8" long, top 1-1/16" / open, bottom 1-5/8" / open, 25 sq ft.
PPM25-4 carries this note from the catalogs: Old design (Unicel); Filbur lists it as Pacific Marquis 25. Neither source gives an OEM number.
PPM25-4 is the Pleatco string Filbur prints next to C-5626 (OEM C-5626 cartridge) on printed p.43. PPM25-4 itself is absent from Pleatco’s 2023 Unicel cross-reference.
C-5626 is easy to confuse on the Marquis Spas table. C-5423 differs by Unicel C-5423, Pleatco PPM35TC, Filbur FC-3623, 11-15/16" long, top closed, 35 sq ft, OEM 20045, note says Closed-top cartridge. Unicel's spec table rates it 34 sq ft and notes the original was 25 sq ft (115 pleats), upgraded to 35 sq ft in the replacement. Unicel lists OEM 370-0215; Filbur prints 370-215.. 5CH-352 differs by Unicel 5CH-352, Pleatco PPM35SC-F2M, Filbur FC-0196, 12-1/2" long, top bar handle, bottom 2” male thread/MPT, 35 sq ft, OEM 20042, note says Pleatco 2023 lists OEM 20042, 370-0242 and 370-0243 for PPM35SC-F2M; Filbur lists OEM 370-0242 for FC-0196 and prints N/A in its Pleatco column..
Left blank on purpose: no OEM part number in sources; no model/model-year fitment in sources.
Source locations for this Marquis Spas row: Unicel 2026 Replacement Guide on C-5626 (OEM cross reference (Marquis Spas section), PDF p.44 (printed p.40); spec table PDF p.10 (printed p.6)). Filbur Catalog & Reference Guide on C-5626 (Product by Pool/Spa Manufacturer (OEM), Marquis Spas, printed p.43 (PDF p.22)).
If you know the Marquis Spas model and not the part number, use the Marquis Spas filter by model and year lookup.
Check the cartridge you removed
Measure diameter, length, and both ends, then compare them with the figures above. The steps are in the measuring guide. Why the bottom decides whether it seals: open-end vs threaded filters. Power, the retainer, and not running the spa empty: how to install a cartridge. Number formats: how Filbur, Unicel and Pleatco numbers compare.
Other Marquis Spas cartridges
- C-5423 cartridge (OEM 20045), 5-3/16" (132 mm) × 11-15/16" (303 mm)
- 5CH-352 cartridge (OEM 20042), 5-3/16" (132 mm) × 12-1/2" (318 mm)
- 5CH-502 cartridge (OEM 20041), 5-3/16" (132 mm) × 12-1/2" (318 mm)
- C-5346 cartridge (OEM 20044), 5-3/16" (132 mm) × 14-1/8" (359 mm)
- 5CH-512 cartridge (OEM 20690), 5-3/16" (132 mm) × 16" (406 mm)
- C-5434 cartridge (OEM 20043), 5-3/16" (132 mm) × 19-5/8" (498 mm)
All 9 Marquis Spas spa filters
Every number on this row, on one screen: cross-reference lookup. Published clean and replace intervals for this cartridge, and a buy link for the numbers above: replacement schedule and reorder. The interval comparison by brand: calculator.
Cleaner and test strips
Hose rinse and soak steps are in how to clean a cartridge. Named cleaners and strips are in filter cleaners and test strips.
Filter cleaner and test strips
-
Leisure Time O Filter Clean Cartridge Cleaner Listing title: cartridge cleaner, 32 fl oz.
-
SpaGuard Filter Cleaner Listing title: filter cleaner for spas and hot tubs, 1 quart.
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AquaChek SPA 6-in-1 Test Strips Listing title: reads total bromine, total chlorine, free chlorine, pH, total alkalinity and total hardness.
Unicel C-5626 Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.
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.43 (PDF p.22) (PDF)
Not in sources: no OEM part number in sources; no model/model-year fitment in sources.