Master Spas spa filter (8CH-66)

Master Spas

Replacement numbers

Unicel 8CH-66, Pleatco PMA60-F2M

Fits Master Spas.

Diameter 8" (203 mm)Length 9-1/4" (235 mm)60 sq ft

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Unicel8CH-66
PleatcoPMA60-F2M
FilburFC-0515
Topsemi-circular handle
Bottom2” male thread/MPT
Ø 8" (203 mm)9-1/4" (235 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. 60 sq ft media.

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Master Spas files this cartridge as 8CH-66 cartridge, in the Master Spas group. Numbers on the row: Unicel 8CH-66; Pleatco PMA60-F2M; Filbur FC-0515. 8" across, 9-1/4" long, top semi-circular handle, bottom 2” male thread/MPT, 60 sq ft.

8CH-66 is easy to confuse on the Master Spas table. C-8341 differs by Unicel C-8341, Pleatco PMA45-2004-R, Filbur FC-1007, 6-3/4" long, top 4" / open w/ raised ring, bottom 4" / open w/ raised ring, 40 sq ft, note says Unicel: part of Eco-Pur filtration system, 2006 to present; two 40 sq ft cartridges required. 7CH-322 differs by Unicel 7CH-322, Pleatco PAS35-F2M, Filbur FC-0420, 7" diameter, 8" long, 32 sq ft, note says Unicel: replacement for 7" or 8" OD Eco-Pur systems; remove black stand pipe for 8" OD.

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 8CH-66 (OEM cross reference (Master Spas section), PDF p.45 (printed p.41); spec table PDF p.20 (printed p.16)). Pleatco 2023 Catalog on 8CH-66 (Unicel-to-Pleatco cross reference, PDF p.47). Filbur Catalog & Reference Guide on 8CH-66 (Product by Pool/Spa Manufacturer (OEM), Master Spas, printed p.43 (PDF p.22)).

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.

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.