Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.
Master Spas spa filter (C-8341)
Master Spas Eco-Pur Micro Filter (2006-present)
Replacement numbers
Unicel C-8341, Pleatco PMA45-2004-R
Fits Master Spas Eco-Pur Micro Filter (2006-present).
Diameter 8" (203 mm)Length 6-3/4" (171 mm)40 sq ft1 model listedPleatco PMA45-2004-R
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| Unicel | C-8341 |
|---|---|
| Pleatco | PMA45-2004-R |
| Filbur | FC-1007 |
| Top | 4" (102 mm) / open w/ raised ring |
| Bottom | 4" (102 mm) / open w/ raised ring |
Bottom: 4" (102 mm) / open w/ raised ring
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. 40 sq ft media.
Master Spas Eco-Pur Micro Filter (2006-present) is the group name on the Master Spas row C-8341 cartridge. Match these numbers: Unicel C-8341; Pleatco PMA45-2004-R; Filbur FC-1007. 8" across, 6-3/4" long, top 4" / open w/ raised ring, bottom 4" / open w/ raised ring, 40 sq ft.
What the sources add about PMA45-2004-R: Unicel: part of Eco-Pur filtration system, 2006 to present; two 40 sq ft cartridges required.
Master Spas applications recorded for this cartridge: Eco-Pur filtration system, years 2006–present, listed by Unicel 2026 Replacement Guide (two cartridges required).
Before ordering C-8341, compare it with C-7330 differs by Unicel C-7330, Pleatco PMA30-2002-R, Filbur FC-1003, 7" diameter, 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; and 7CH-322 differs by Unicel 7CH-322, Pleatco PAS35-F2M, Filbur FC-0420, 7" diameter, 8" long, top semi-circular handle, bottom 2” male thread/MPT, 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: Unicel lists no OEM part number for this brand entry.
Where those figures are printed: Unicel 2026 Replacement Guide on C-8341 (OEM cross reference (Master Spas section), PDF p.45 (printed p.41); spec table PDF p.20 (printed p.16)). Pleatco 2023 Catalog on C-8341 (Unicel-to-Pleatco cross reference, PDF p.47). Filbur Catalog & Reference Guide on C-8341 (Product by Pool/Spa Manufacturer (OEM), Master Spas, printed p.43 (PDF p.22)).
Hot tubs listed for this cartridge
The rest of the Master Spas model list is the Master Spas filter by model and year lookup.
| Model / system | Years | Listed by |
|---|---|---|
| Eco-Pur filtration system (two cartridges required) | 2006–present | 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. Brand notes: Master Spas Eco-Pur filters. Number formats: how Filbur, Unicel and Pleatco numbers compare.
Other Master Spas cartridges
- C-7330 cartridge, 7" (178 mm) × 7-1/4" (184 mm)
- 7CH-322 cartridge, 7" (178 mm) × 8" (203 mm)
- 6CH-352 cartridge (OEM PMA-R1), 6" (152 mm) × 8" (203 mm)
- 6CH-940 cartridge, 6" (152 mm) × 8-1/4" (210 mm)
- 6CH-402 cartridge (OEM PMA40L-F2M), 6" (152 mm) × 9-1/2" (241 mm)
- 4CH-252 cartridge (OEM X268521), 4-5/8" (117 mm) × 8" (203 mm)
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
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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.
Pleatco PMA45-2004-R Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.
Sources
- Unicel 2026 Replacement Guide: OEM cross reference (Master Spas section), PDF p.45 (printed p.41); spec table PDF p.20 (printed p.16) (PDF)
- Pleatco 2023 Catalog: Unicel-to-Pleatco cross reference, PDF p.47 (PDF)
- Filbur Catalog & Reference Guide: Product by Pool/Spa Manufacturer (OEM), Master Spas, printed p.43 (PDF p.22) (PDF)
Not in sources: Unicel lists no OEM part number for this brand entry.