Master Spas spa filter (7CH-322)

Master Spas Eco-Pur (7"/8" OD)

Replacement numbers

Unicel 7CH-322, Pleatco PAS35-F2M

Fits Master Spas Eco-Pur (7"/8" OD).

Diameter 7" (178 mm)Length 8" (203 mm)32 sq ft

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Unicel7CH-322
PleatcoPAS35-F2M
FilburFC-0420
Topsemi-circular handle
Bottom2” male thread/MPT
Ø 7" (178 mm)8" (203 mm)Side view · end views belowTopBottom
Top: semi-circular handle
Bottom: 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. 32 sq ft media.

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Master Spas files this cartridge as 7CH-322 cartridge, in the Master Spas Eco-Pur (7"/8" OD) group. Numbers on the row: Unicel 7CH-322; Pleatco PAS35-F2M; Filbur FC-0420. 7" across, 8" long, top semi-circular handle, bottom 2” male thread/MPT, 32 sq ft.

PAS35-F2M carries this note from the catalogs: Unicel: replacement for 7" or 8" OD Eco-Pur systems; remove black stand pipe for 8" OD.

7CH-322 is easy to confuse on the Master Spas table. C-7330 differs by Unicel C-7330, Pleatco PMA30-2002-R, Filbur FC-1003, 7-1/4" long, top 4-1/8" / open, bottom 4-1/8" / open, 30 sq ft, note says Unicel: part of Eco-Pur filtration system, 2002 to 2005. 6CH-352 differs by Unicel 6CH-352, Pleatco PAS40-F2M, Filbur FC-0312, 6" diameter, 35 sq ft, OEM PMA-R1, note says Unicel: must remove black stand pipe. Filbur cross-references 6CH-352 to FC-0312 but lists FC-0312 at 6" x 7".

Left blank on purpose: no model/model-year fitment in sources; Unicel lists no OEM part number for this brand entry.

Source locations for this Master Spas row: Unicel 2026 Replacement Guide on 7CH-322 (OEM cross reference (Master Spas section), PDF p.45 (printed p.41); spec table PDF p.14 (printed p.10)). Pleatco 2023 Catalog on 7CH-322 (Unicel-to-Pleatco cross reference, PDF p.47). Filbur Catalog & Reference Guide on 7CH-322 (Unicel-to-Filbur reverse cross reference, printed p.66 (PDF p.34)).

If you know the Master Spas model and not the part number, use the Master 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. Brand notes: Master Spas Eco-Pur filters. Number formats: how Filbur, Unicel and Pleatco numbers compare.

The same 7CH-322 number is also on the Coleman Spas page.

Other Master Spas cartridges

All 13 Master 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/model-year fitment in sources; Unicel lists no OEM part number for this brand entry.