5-3/16" × 12-1/2"
Marquis Spas spa filters
Marquis Spas cartridges are mostly 5-3/16"-diameter filters, split between two designs: open-top "SC" style cartridges such as 5CH-352 and 5CH-502, and closed-top cartridges such as C-5423 and C-5434. Filbur lists the brand as Pacific Marquis, and the Unicel guide notes that C-5423 and C-5434 were upgraded from their original 25 and 40 sq ft ratings to 35 and 60 sq ft replacements.
The two catalogs do not always agree on the Marquis OEM number. Where they conflict, as on C-5346, the row is flagged and kept out of search results until the number is confirmed, so check the print on your old cartridge first.
This page lists 9 Marquis Spas replacement cartridges from the Unicel 2026 Replacement Guide, the Pleatco 2023 catalog, the Filbur catalog and manufacturer and retailer pages, plus model and model-year fitment for 6 of them (13 hot tub models in total). 7 have a Filbur number. Find your spa filter by the OEM part number on the end cap, or measure it and compare sizes below.
Clean and replace intervals for one cartridge on this list, plus the cross-reference numbers and a buy link: filter replacement schedule and reorder.
- 20042; 20092; 370-0240; 370-0242; 370-0243; 370-0683; 370-06985CH-352, 5-3/16" (132 mm) × 12-1/2" (318 mm)See replacement
- 20041; 20091; 370-02375CH-502, 5-3/16" (132 mm) × 12-1/2" (318 mm)See replacement
- 20045; 370-0215C-5423, 5-3/16" (132 mm) × 11-15/16" (303 mm)See replacement
- 20043; 370-0216C-5434, 5-3/16" (132 mm) × 19-5/8" (498 mm)See replacement
- 20044; 370-0236C-5346, 5-3/16" (132 mm) × 14-1/8" (359 mm)See replacement
- 20690; 370-06995CH-512, 5-3/16" (132 mm) × 16" (406 mm)See replacement
- 20499; 370-06945CH-902AM, 5-3/16" (132 mm) × 30" (762 mm)See replacement
- C-5626C-5626, 5-3/16" (132 mm) × 11-7/8" (302 mm)See replacement
- C-5637C-5637, 5-3/16" (132 mm) × 19-5/8" (498 mm)See replacement
| Cartridge | Unicel | Pleatco | Filbur | Size | Fits | Status |
|---|---|---|---|---|---|---|
| 20042; 20092; 370-0240; 370-0242; 370-0243; 370-0683; 370-0698 | 5CH-352 | PPM35SC-F2M | FC-0196 | 5-3/16" (132 mm) × 12-1/2" (318 mm), 35 sq ft | 7 models | verified |
| 20041; 20091; 370-0237 | 5CH-502 | PPM50SC-F2M | FC-0195 | 5-3/16" (132 mm) × 12-1/2" (318 mm), 50 sq ft | 3 models | verified |
| 20045; 370-0215 | C-5423 | PPM35TC | FC-3623 | 5-3/16" (132 mm) × 11-15/16" (303 mm), 35 sq ft | 1 model | verified |
| 20043; 370-0216 | C-5434 | PPM60TC | FC-3634 | 5-3/16" (132 mm) × 19-5/8" (498 mm), 60 sq ft | not listed | verified |
| 20044; 370-0236 | C-5346 | PPM50TC | FC-3638 | 5-3/16" (132 mm) × 14-1/8" (359 mm), 50 sq ft | 1 model | verified |
| 20690; 370-0699 | 5CH-512 | not listed | not listed | 5-3/16" (132 mm) × 16" (406 mm), 50 sq ft | 3 models | verified |
| 20499; 370-0694 | 5CH-902AM | not listed | not listed | 5-3/16" (132 mm) × 30" (762 mm), 90 sq ft | 2 models | unverified |
| C-5626 (Marquis Spas (listed as Pacific Marquis in the Filbur catalog)) | C-5626 | PPM25-4 | FC-3626 | 5-3/16" (132 mm) × 11-7/8" (302 mm), 25 sq ft | not listed | verified |
| C-5637 (Marquis Spas (listed as Pacific Marquis in the Filbur catalog)) | C-5637 | PPM40-4 | FC-3637 | 5-3/16" (132 mm) × 19-5/8" (498 mm), 40 sq ft | not listed | verified |
Know your model but not the part number? See Marquis Spas filter by model and year.
3 of these rows do not have enough detail for a stand-alone page (for example, no OEM number or no second cross-reference), so their pages are kept out of search results and this table is the main reference for them.
Brands that share cartridges with Marquis Spas
- Cal Spas, same part number 5CH-502
Guides that apply to Marquis Spas
- Open-end vs threaded hot tub filters
- How Filbur, Unicel and Pleatco numbers compare
- How to find your spa filter size
- How to install a cartridge
- All guides
Search Marquis Spas part numbers on Amazon
Each button opens an Amazon search for that part number. The cartridge page is where the cited size and fittings are. Match those before you buy.
Part numbers from this table
-
5CH-352 cartridge (OEM 20042) -
5CH-502 cartridge (OEM 20041) 5-3/16" × 12-1/2"
-
C-5423 cartridge (OEM 20045) 5-3/16" × 11-15/16"
-
C-5434 cartridge (OEM 20043) 5-3/16" × 19-5/8"
Disclosure: we may earn a commission from qualifying purchases made through retailer links on this site, at no extra cost to you. As an Amazon Associate I earn from qualifying purchases. Amazon links on this page go to Amazon.com and are affiliate links; they never change what we write, and the list is not ranked by commission. Each “Search on Amazon” button opens an Amazon search for the part or product name shown, not a single listing we pre-checked. Check size, quantity and your spa maker’s guidance before you buy. See our affiliate disclosure.
Model-year fitment comes only from the sources named on each cartridge page. Where no source lists models or years, the page says so.