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Maax Spas OEM 104309 spa filter (5CH-35)
Maax Spas of AZ
Replacement numbers
Unicel 5CH-35, Pleatco PMAX50P4
Fits Maax Spas OEM 104309.
Diameter 5-5/8" (143 mm)Length 8" (203 mm)35 sq ft1 model listedSearch this part on Amazon
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| Unicel | 5CH-35 |
|---|---|
| Pleatco | PMAX50P4 (Cross-reference PDF p.47: 5CH-35 = PMAX50P4. Spec PDF p.32: PMAX50P4 is 5-3/4" x 8", 1-1/2" MPT, 50 sq ft, Maax Spas of Canada, no OEM. The same page prints PAS35P4 at 5-7/8" x 7-3/4", 35 sq ft, Elite Spas (Coleman), no OEM.) |
| Filbur | FC-0300 |
| Top | semi-circular handle |
| Bottom | 1-1/2" male thread/MPT |
Bottom: 1-1/2" male thread/MPT
Drawn to scale from the listed diameter and length. Handles, threads and closed ends are drawn as symbols, not to scale. 35 sq ft media.
Maax Spas of AZ is the group name on the Maax Spas row 5CH-35 cartridge (OEM 104309). Match these numbers: OEM 104309; Unicel 5CH-35; Pleatco PMAX50P4; Filbur FC-0300. 5-5/8" across, 8" long, top semi-circular handle, bottom 1-1/2" male thread/MPT, 35 sq ft.
What the sources add about 104309: 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.
5CH-35 (OEM 104309), Pleatco side: Cross-reference PDF p.47: 5CH-35 = PMAX50P4. Spec PDF p.32: PMAX50P4 is 5-3/4" x 8", 1-1/2" MPT, 50 sq ft, Maax Spas of Canada, no OEM. The same page prints PAS35P4 at 5-7/8" x 7-3/4", 35 sq ft, Elite Spas (Coleman), no OEM..
104309, Filbur note: PDF p.16, Coleman section: FC-0300, 5-5/8" x 8", 1-1/2" MPT, 35 sq ft, PAS35P, 5CH-35, Elite Spa by Coleman. PDF p.18: Maax/Coleman Spas, same size, 35 sq ft. OEM 104309 is not in those cells..
Maax Spas applications recorded for this cartridge: Elite Spas, no year range printed, listed by Unicel 2026 Replacement Guide (Maax of AZ line: OEM 104309 at 35 sq ft. A separate Unicel heading prints 50 sq ft and no OEM.).
Before ordering 5CH-35, compare it with 5CH-25 differs by Unicel 5CH-25, Pleatco PMAX25P4, no Filbur number, 6" long, 25 sq ft, OEM 108868, note says Unicel's Maax Spas of AZ list puts Elegant, Intrigue and Joli on one cartridge: 25 sq ft, 5-5/8" x 6", 1-1/2" MPT, OEM 108868, 5CH-25. The spec table adds 201 pleats and 3 oz. Pleatco PMAX25P4 lists OEM 108868 at 5-3/4" x 6", still 25 sq ft and still 1-1/2" MPT. A text search of the Filbur catalog found no 5CH-25, no PMAX25 and no 108868.; and C-4950 differs by Unicel C-4950, Pleatco PRB50-IN, Filbur FC-2390, 4-15/16" diameter, 13-5/16" long, top 2-1/8" / open, bottom 2-1/8" / open, 50 sq ft, OEM 100533, note says 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"..
Left blank on purpose: Unicel prints 35 sq ft on the spec table and the Maax of AZ line (with OEM 104309) and 50 sq ft on the Elite Spas by Maax heading (no OEM). Pleatco's cross-reference number PMAX50P4 is 50 sq ft. PAS35P4 is 35 sq ft at 5-7/8" x 7-3/4". Filbur is 35 sq ft and does not print OEM 104309..
Pages checked for 104309: Unicel 2026 Replacement Guide on 5CH-35 (Maax Spas of AZ PDF p.44: Elite Spas, 104309, 5CH-35, 35 sq ft, 5-5/8" x 8", 1-1/2" MPT. Spec table PDF p.11: 203 pleats, 35 sq ft. Heading Elite Spas by Maax, PDF p.34 (printed p.30): 50 sq ft, same body, no OEM.). Pleatco 2023 Catalog on 5CH-35 (PDF p.47: 5CH-35 = PMAX50P4. PDF p.32: PMAX50P4 at 50 sq ft (Maax of Canada) and PAS35P4 at 35 sq ft (Elite Spas, Coleman), 5-7/8" x 7-3/4".). Filbur Catalog & Reference Guide on 5CH-35 (FC-0300, PDF p.16 and p.18: 5-5/8" x 8", 35 sq ft, PAS35P, 5CH-35, Elite Spa by Coleman / Maax/Coleman Spas).
Hot tubs listed for this cartridge
The rest of the Maax Spas model list is the Maax Spas filter by model and year lookup.
| Model / system | Years | Listed by |
|---|---|---|
| Elite Spas (Maax of AZ line: OEM 104309 at 35 sq ft. A separate Unicel heading prints 50 sq ft and no OEM.) | not given | Unicel 2026 Replacement Guide |
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 Maax Spas cartridges
- 5CH-25 cartridge (OEM 108868), 5-5/8" (143 mm) × 6" (152 mm)
- C-4950 cartridge (OEM 100533), 4-15/16" (125 mm) × 13-5/16" (338 mm)
- C-5374 cartridge (OEM 107092), 5-5/16" (135 mm) × 14-13/16" (376 mm)
- C-8450 cartridge (OEM 100593), 8" (203 mm) × 9" (229 mm)
- C-8475 cartridge (OEM 100594), 8" (203 mm) × 13" (330 mm)
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.
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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.
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Sources
- Unicel 2026 Replacement Guide: Maax Spas of AZ PDF p.44: Elite Spas, 104309, 5CH-35, 35 sq ft, 5-5/8" x 8", 1-1/2" MPT. Spec table PDF p.11: 203 pleats, 35 sq ft. Heading Elite Spas by Maax, PDF p.34 (printed p.30): 50 sq ft, same body, no OEM. (PDF)
- Pleatco 2023 Catalog: PDF p.47: 5CH-35 = PMAX50P4. PDF p.32: PMAX50P4 at 50 sq ft (Maax of Canada) and PAS35P4 at 35 sq ft (Elite Spas, Coleman), 5-7/8" x 7-3/4". (PDF)
- Filbur Catalog & Reference Guide: FC-0300, PDF p.16 and p.18: 5-5/8" x 8", 35 sq ft, PAS35P, 5CH-35, Elite Spa by Coleman / Maax/Coleman Spas (PDF)
Not in sources: Unicel prints 35 sq ft on the spec table and the Maax of AZ line (with OEM 104309) and 50 sq ft on the Elite Spas by Maax heading (no OEM). Pleatco's cross-reference number PMAX50P4 is 50 sq ft. PAS35P4 is 35 sq ft at 5-7/8" x 7-3/4". Filbur is 35 sq ft and does not print OEM 104309..