Opens an Amazon search for this part number, not one listing we pre-checked.
5CH-902AM spa filter equivalents
Part number 5CH-902AM 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 5CH-902AM cartridge (OEM 20499), 5-3/16" (132 mm) × 30" (762 mm), 90 sq ft. Unicel 5CH-902AM, Pleatco not listed.
Search this part on Amazon
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. Search on Amazon opens an Amazon search for this part number, not one listing we pre-checked. These are affiliate links. Product photos are omitted unless Amazon supplied one through the Product Advertising API or a SiteStripe image link. Verify dimensions before ordering. See our affiliate disclosure.
| OEM | 20499 |
|---|---|
| Unicel | 5CH-902AM |
| Pleatco | not listed |
| Filbur | not listed |
| Size | 5-3/16" (132 mm) × 30" (762 mm), 90 sq ft |
Unverified. This row has not been fully confirmed against a second source. Gaps: no Pleatco equivalent; no Filbur equivalent; no Marquis document found. Checked 2026-11-01: two spa dealers confirm OEM 20499 as a 90 sq ft, ~30" threaded swim-spa cartridge with a handle (one also gives 20496 as the earlier number), but give the outside diameter as about 5-1/4" to 5-1/2" against Unicel's 5-3/16", and one describes a fine ~1.85" thread rather than 2" MPT Checked 2026-11-04: Filbur's Marquis section does not list 20499 or 5CH-902AM. OGS Pool and Spa's listing prints 5-3/16" x 30", handle, a 2" bottom and 90 sq ft, matching Unicel's diameter and length, but it does not say whether that 2" bottom is MPT or the fine thread Mastercraft describes. Checked 2026-11-06: Parts4tubs lists 5CH-902AM as a Unicel cartridge for Marquis Spas and reprints the catalog line "Cartridge, 90sqft, Bar ht, 2"mpt b, 5-3/16", 30", 4oz" (UPC 678285250115). That matches Unicel's diameter, length and 2" MPT wording. It is not a separate measurement of the fine thread. Checked 2026-11-07: no new measurement of the thread. A listing that reprints Unicel’s 2" MPT line does not settle the fine-thread description from 2026-11-01. Still unresolved. Checked 2026-11-08: Unicel PDF p.10 (spec) and PDF p.44 (Marquis OEM) still print 5CH-902AM at 5-3/16" x 30", 2" MPT, 90 sq ft, OEM 20499 and 370-0694. Pleatco 2023 and Filbur have no 5CH-902 and no 20499. No new measurement of the fine thread. Still unresolved.. Measure your old cartridge before ordering.
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)
- Southern Leisure Spas (spa dealer listing): replaces Marquis 20499 and 20496; ~90 sq ft, ~30" body, closed top with handle, ~2" male thread, OD ~5-1/4" to 5-1/2"; Marquis ATV 14/17 and select 2023+ V174S/V174K (web page)
- Mastercraft Pool and Spa (spa dealer listing): Marquis P/N 20499, 90 sq ft, 31.5" long, 5.5" OD, bar handle, threaded bottom; Marquis ATV 14 and ATV 17 swim spas (web page)
- OGS Pool and Spa (spa dealer listing): Product description fetched 2026-11-04: Marquis ATV Models, diameter 5 3/16", length 30", top handle, bottom 2", 90 sq ft, Microban. Does not say MPT or fine thread. (web page)
- Parts4tubs (Unicel cartridge listing): Fetched 2026-11-06: Unicel 5CH-902AM for Marquis Spas. Catalog description repeats "90sqft, Bar ht, 2"mpt b, 5-3/16", 30", 4oz". UPC 678285250115. Not an independent thread measurement. (web page)
Full details → · All Marquis Spas spa filters · Which fitting you need · How to install it