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 OEM 20041 spa filter (5CH-502)
Marquis Spas (listed as Pacific Marquis in the Filbur catalog)
Replacement numbers
Unicel 5CH-502, Pleatco PPM50SC-F2M
Fits Marquis Spas OEM 20041, 20091, 370-0237.
Diameter 5-3/16" (132 mm)Length 12-1/2" (318 mm)50 sq ft3 models listedUnicel 5CH-502
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| Unicel | 5CH-502 |
|---|---|
| Pleatco | PPM50SC-F2M |
| Filbur | FC-0195 |
| Top | bar handle |
| Bottom | 2” male thread/MPT |
Bottom: 2” male thread/MPT
Drawn to scale from the listed diameter and length. Handles, threads and closed ends are drawn as symbols, not to scale. 50 sq ft media.
Marquis Spas files this cartridge as 5CH-502 cartridge (OEM 20041), in the Marquis Spas (listed as Pacific Marquis in the Filbur catalog) group. Numbers on the row: OEM 20041, 20091, 370-0237; Unicel 5CH-502; Pleatco PPM50SC-F2M; Filbur FC-0195. 5-3/16" across, 12-1/2" long, top bar handle, bottom 2” male thread/MPT, 50 sq ft.
20041 carries this note from the catalogs: Unicel notes this part number was formerly C-5303, and also lists the cartridge under Cal Spas. Filbur prints the Pleatco number as PPM350SC-F2M; Pleatco's own catalog and its Filbur-to-Pleatco table give PPM50SC-F2M, which is what is shown here.
Model list attached to 5CH-502 cartridge (OEM 20041): Pacific Marquis Spas, no year range printed, listed by Pleatco 2023 Catalog (Pleatco spec table, OEM 20041 / 370-0237); Cal Spas Low Flow Recirc 48SF, no year range printed, listed by Pleatco 2023 Catalog (same Pleatco row); Marquis Signature Series, years 2000–2021, listed by Marquis Spas filter finder (threaded 50 sq ft, part 20091).
5CH-502 is easy to confuse on the Marquis Spas table. 5CH-352 differs by Unicel 5CH-352, Pleatco PPM35SC-F2M, Filbur FC-0196, 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.. C-5423 differs by Unicel C-5423, Pleatco PPM35TC, Filbur FC-3623, 11-15/16" long, top closed, bottom 1-5/8" / open, 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..
Left blank on purpose: Marquis's 2001 and 2002 owner's manuals name a single #5040 50 sq ft cartridge for all 2000-and-later spas.
Pages checked for 20041: Unicel 2026 Replacement Guide on 5CH-502 (OEM cross reference (Marquis Spas section), PDF p.44 (printed p.40); spec table PDF p.10 (printed p.6)). Pleatco 2023 Catalog on 5CH-502 (Unicel-to-Pleatco cross reference, PDF p.47 (5CH-502 = PPM50SC-F2M); Filbur-to-Pleatco PDF p.48 (FC-0195 = PPM50SC-F2M); spec table PDF p.32 (OEM 20041, 370-0237)). Filbur Catalog & Reference Guide on 5CH-502 (Product by Pool/Spa Manufacturer (OEM), Marquis Spas, printed p.42 (PDF p.22)). Marquis Spas (manufacturer filter finder) on 5CH-502 (Filter Finder (series, model years, slip-on/threaded, sq ft, part number): 20091 threaded 50 for Signature Series 2000–2021).
Hot tubs listed for this cartridge
The rest of the Marquis Spas model list is the Marquis Spas filter by model and year lookup.
| Model / system | Years | Listed by |
|---|---|---|
| Pacific Marquis Spas (Pleatco spec table, OEM 20041 / 370-0237) | not given | Pleatco 2023 Catalog |
| Cal Spas Low Flow Recirc 48SF (same Pleatco row) | not given | Pleatco 2023 Catalog |
| Marquis Signature Series (threaded 50 sq ft, part 20091) | 2000–2021 | Marquis Spas filter finder |
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.
The same 5CH-502 number is also on the Cal Spas page.
Other Marquis Spas cartridges
- 5CH-352 cartridge (OEM 20042), 5-3/16" (132 mm) × 12-1/2" (318 mm)
- C-5423 cartridge (OEM 20045), 5-3/16" (132 mm) × 11-15/16" (303 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
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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 5CH-502 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)
- Pleatco 2023 Catalog: Unicel-to-Pleatco cross reference, PDF p.47 (5CH-502 = PPM50SC-F2M); Filbur-to-Pleatco PDF p.48 (FC-0195 = PPM50SC-F2M); spec table PDF p.32 (OEM 20041, 370-0237) (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): 20091 threaded 50 for Signature Series 2000–2021 (web page)
Not in sources: Marquis's 2001 and 2002 owner's manuals name a single #5040 50 sq ft cartridge for all 2000-and-later spas.