Maax Spas OEM 100533 spa filter (C-4950)

Maax Spas of AZ

Replacement numbers

Unicel C-4950, Pleatco PRB50-IN

Fits Maax Spas OEM 100533.

Diameter 4-15/16" (125 mm)Length 13-5/16" (338 mm)50 sq ft

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. Check price on Amazon opens the Unicel C-4950 listing we 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. Each “Check price on Amazon” button opens a specific listing whose title we checked. The line under the name repeats only that title. See our affiliate disclosure.

UnicelC-4950
PleatcoPRB50-IN (Spec table PDF p.32: PRB50-IN lists OEM 100533 at 5" OD, 50 sq ft.)
FilburFC-2390
Top2-1/8" (54 mm) / open
Bottom2-1/8" (54 mm) / open
Ø 4-15/16" (125 mm)13-5/16" (338 mm)Side view · end views belowTopBottom
Top: 2-1/8" (54 mm) / open
Bottom: 2-1/8" (54 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.

Request a filter replacement reminder

This stores a request for this filter: the model, the date you installed it, and how often you replace it. Submitting stores the request and does not send email.

We'll only use your email for this request.

Deletion requests go only to the address on the privacy page.

Maax Spas of AZ is the group name on the Maax Spas row C-4950 cartridge (OEM 100533). Match these numbers: OEM 100533; Unicel C-4950; Pleatco PRB50-IN; Filbur FC-2390. 4-15/16" across, 13-5/16" long, top 2-1/8" / open, bottom 2-1/8" / open, 50 sq ft.

Catalog note for 100533: Maax of AZ prints OEM 100533 on a 50 sq ft, 4-15/16" x 13-5/16" line and names no model. The heading says see also Coleman Spas. Coleman's block pairs 100533 with 3301-2145. This Maax row does not add the 3301 number, because Unicel does not print it under Maax. Pleatco's outside diameter for PRB50-IN is 5".

C-4950 (OEM 100533), Pleatco side: Spec table PDF p.32: PRB50-IN lists OEM 100533 at 5" OD, 50 sq ft..

100533, Filbur note: Filed under Coleman Spas, PDF p.16, not under a Maax heading: FC-2390, OEM 100533, C-4950, 50 sq ft..

C-4950 is easy to confuse on the Maax Spas table. C-5374 differs by Unicel C-5374, Pleatco PLBS75, Filbur FC-2971, 5-5/16" diameter, 14-13/16" long, 65 sq ft, OEM 107092, note says Maax of AZ prints OEM 107092 as C-5374, 65 sq ft, 5-5/16" x 14-13/16", with no model name. Unicel's spec table gives 223 pleats, 3 oz, 65 sq ft, open 2-1/8", for Rec Warehouse S2/G2, Rainbow and Waterway. The S2/G2 OEM line in the same guide prints 75 sq ft for C-5374. Pleatco's cross-reference says C-5374 = PLBS75, and the PLBS75 spec is 5-5/16" x 14-3/4", 75 sq ft, with OEM 817-0015, 303433 and R173600, not 107092. Filbur FC-2971 is 5-5/16" x 14-11/16" and 65 sq ft. The size stored here is Unicel's spec table.. 5CH-35 differs by Unicel 5CH-35, Pleatco PMAX50P4, Filbur FC-0300, 5-5/8" diameter, 8" long, top semi-circular handle, bottom 1-1/2" male thread/MPT, 35 sq ft, OEM 104309, note says Unicel's Maax of AZ line names Elite Spas on OEM 104309, 5CH-35, 35 sq ft, 5-5/8" x 8", 1-1/2" MPT. The spec table agrees: 203 pleats, 3 oz, 35 sq ft. A separate heading, Elite Spas by Maax, prints 50 sq ft for the same diameter, length, thread and Unicel number, and prints no OEM. Pleatco's cross-reference sends 5CH-35 to PMAX50P4, specified at 5-3/4" x 8", 50 sq ft, for Maax Spas of Canada, with no OEM. Pleatco also prints PAS35P4 for Elite Spas (Coleman) at 5-7/8" x 7-3/4", 35 sq ft, with no OEM. Filbur FC-0300 is 5-5/8" x 8", 35 sq ft, and its Pleatco cell is PAS35P. The square feet stored here are the spec table's 35. PMAX50P4 is not that 35 sq ft cartridge..

Left blank on purpose: No model name. Outside diameter 4-15/16" versus Pleatco's 5". The 3301-2145 twin is on the Coleman row only..

Pages checked for 100533: Unicel 2026 Replacement Guide on C-4950 (Maax Spas of AZ PDF p.44: 100533 = C-4950, 50 sq ft, 4-15/16" x 13-5/16", no model name. The heading says see also Coleman Spas.). Pleatco 2023 Catalog on C-4950 (Spec table PDF p.32: PRB50-IN includes OEM 100533). Filbur Catalog & Reference Guide on C-4950 (Coleman Spas section PDF p.16: FC-2390, OEM 100533, C-4950. No separate Maax heading for this OEM.).

If you know the Maax Spas model and not the part number, use the Maax 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.

The same C-4950 number is also on the Caldera, Jacuzzi, Sundance, Beachcomber, Coleman Spas pages.

Other Maax Spas cartridges

All 6 Maax 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: No model name. Outside diameter 4-15/16" versus Pleatco's 5". The 3301-2145 twin is on the Coleman row only..