Marquis Spas OEM 20044 spa filter (C-5346)

Marquis Spas (listed as Pacific Marquis in the Filbur catalog)

Replacement numbers

Unicel C-5346, Pleatco PPM50TC

Fits Marquis Spas OEM 20044, 370-0236.

Diameter 5-3/16" (132 mm)Length 14-1/8" (359 mm)50 sq ft1 model listed

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UnicelC-5346
PleatcoPPM50TC (as printed in the Filbur catalog Marquis Spas section (printed p.43); not found in the Pleatco 2023 Unicel cross reference)
FilburFC-3638
Topclosed
Bottom1-5/8" (41 mm) / open
Ø 5-3/16" (132 mm)14-1/8" (359 mm)Side view · end views belowTopBottom
Top: closed
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. 50 sq ft media.

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For Marquis Spas, C-5346 cartridge (OEM 20044) sits in Marquis Spas (listed as Pacific Marquis in the Filbur catalog). The cross-reference prints OEM 20044, 370-0236; Unicel C-5346; Pleatco PPM50TC; Filbur FC-3638. 5-3/16" across, 14-1/8" long, top closed, bottom 1-5/8" / open, 50 sq ft.

Catalog note for 20044: Closed-top slip-on cartridge, old style. Marquis's own filter finder lists 20044 as the slip-on 50 sq ft filter for 1997–1999 Signature Series spas, which matches Unicel's C-5346 (5-3/16" x 14-1/8", closed top, 1-5/8" open bottom, 50 sq ft) and Filbur's FC-3638 of the same size. The second factory number still differs: Unicel lists 370-0236, while Filbur prints 370-217 for the same size.

PPM50TC is the Pleatco string Filbur prints next to C-5346 (OEM 20044) on printed p.43. PPM50TC itself is absent from Pleatco’s 2023 Unicel cross-reference.

Model list attached to C-5346 cartridge (OEM 20044): Marquis Signature Series, years 1997–1999, listed by Marquis Spas filter finder (slip-on 50 sq ft, part 20044).

C-5346 is easy to confuse on the Marquis Spas table. 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.. 5CH-502 differs by Unicel 5CH-502, Pleatco PPM50SC-F2M, Filbur FC-0195, 12-1/2" long, top bar handle, bottom 2” male thread/MPT, OEM 20041, note says 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..

Left blank on purpose: alternate OEM number differs between Unicel (370-0236) and Filbur (370-217); Marquis's finder gives 20044 only and no dimensions.

Where those figures are printed: Unicel 2026 Replacement Guide on C-5346 (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-5346 (Product by Pool/Spa Manufacturer (OEM), Marquis Spas, printed p.43 (PDF p.22)). Marquis Spas (manufacturer filter finder) on C-5346 (Filter Finder (series, model years, slip-on/threaded, sq ft, part number): Signature Series 1997–1999, slip-on 50, 20044).

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 / systemYearsListed by
Marquis Signature Series (slip-on 50 sq ft, part 20044)1997–1999Marquis 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.

Other Marquis Spas cartridges

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

Sources

Not in sources: alternate OEM number differs between Unicel (370-0236) and Filbur (370-217); Marquis's finder gives 20044 only and no dimensions.