Waterway Plastics OEM 817-0011 spa filter (6CH-941)

Front access, stacked upper

Replacement numbers

Unicel 6CH-941, Filbur FC-0360

Fits Waterway Plastics OEM 817-0011.

Diameter 6" (152 mm)Length 8-1/4" (210 mm)45 sq ft

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Unicel6CH-941
Pleatconot found in source (Spec table PDF p.33: PWW100P3-SET, 6" x 16-1/2", handle, 1-1/2" SAE, 100 sq ft, OEM 817-0011 / 817-0012 and CMP 25253 / 25254. Cross-reference PDF p.47 sends both 6CH-941 and 6CH-942 to that set. Not stored as this row's Pleatco equivalent because it is the pair.)
FilburFC-0360
Topsemi-circular handle
Bottom1-3/4" male slip
Ø 6" (152 mm)8-1/4" (210 mm)Side view · end views belowTopBottom
Top: semi-circular handle
Bottom: 1-3/4" male slip
Drawn to scale from the listed diameter and length. Handles, threads and closed ends are drawn as symbols, not to scale. 45 sq ft media.

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Front access, stacked upper is the group name on the Waterway Plastics row 6CH-941 cartridge (OEM 817-0011). Match these numbers: OEM 817-0011; Unicel 6CH-941; Filbur FC-0360. 6" across, 8-1/4" long, top semi-circular handle, bottom 1-3/4" male slip, 45 sq ft.

What the sources add about 817-0011: Upper half of the stacked front-access pair. Unicel says 6CH-941 must be used with 6CH-942. Waterway's table calls 817-0011 a 50 sq ft upper cartridge. The spec table prints 45 sq ft and 225 pleats, which is the figure stored here. The bottom is a 1-3/4" male slip, not the 1-1/2" SAE of 817-0050. Pleatco's live number is the pair, PWW100P3-SET, 6" x 16-1/2" and 100 sq ft, so it is not stored as the equivalent of this one cartridge. Filbur's description says 40 sq ft and the Waterway sq ft column prints 80.

6CH-941 (OEM 817-0011), Pleatco side: Spec table PDF p.33: PWW100P3-SET, 6" x 16-1/2", handle, 1-1/2" SAE, 100 sq ft, OEM 817-0011 / 817-0012 and CMP 25253 / 25254. Cross-reference PDF p.47 sends both 6CH-941 and 6CH-942 to that set. Not stored as this row's Pleatco equivalent because it is the pair..

817-0011, Filbur note: Waterway section PDF p.28: FC-0360, 6 x 8-1/4, 1-3/4" male slip, OEM 817-0011, PWW100ST-P3, 6CH-941, sq ft column 80, stacked with FC-0361..

Before ordering 6CH-941, compare it with 6CH-940 differs by Unicel 6CH-940, Pleatco PWW50P3, Filbur FC-0359, bottom 1-1/2" SAE, OEM 817-0050, note says Front-access cartridge. Waterway's Service Logic table (fetched 2026-11-09) calls 817-0050 a 50 sq ft, 6" x 8-1/4" F/A skimmer cartridge. Unicel's Waterway list prints the same 50 sq ft, and a second line at 100 sq ft with the note that two cartridges are used side by side. The spec table and Unicel's own product list print 6CH-940 at 45 sq ft, 225 pleats. The 45 stored here is the spec-table figure. Pleatco PWW50P3 is 6" x 7-5/8", 50 sq ft, and says two are required. Filbur FC-0359's sq ft column is 40.; and 6CH-942 differs by Unicel 6CH-942, Filbur FC-0361, top 1-3/4" open, bottom 1-1/2" SAE, OEM 817-0012, note says Lower half of the stacked front-access pair. Top is 1-3/4" open so the upper cartridge's slip can enter it. Bottom is 1-1/2" SAE. Unicel says it must be used with 6CH-941. Waterway's table calls 817-0012 a 50 sq ft lower cartridge. The spec table prints 45 sq ft, stored here. Filbur's description says 40 and the Waterway column prints 80. Pleatco's PWW100P3-SET is the pair, not this cartridge alone..

Pleatco does not have a number on this row. Search 817-0011 or the Waterway Plastics part you pulled out of the spa.

Left blank on purpose: Per cartridge: 50 (Waterway) vs 45 (Unicel spec) vs 40 (Filbur description). Filbur's Waterway column prints 80. Pleatco rates the pair, not this cartridge alone, at 100 sq ft..

Pages checked for 817-0011: Unicel 2026 Replacement Guide on 6CH-941 (Waterway list PDF p.64: 817-0011 = 6CH-941, stacked with 817-0012; the 100 and 200 lines are housing totals. Spec table PDF p.12: 45 sq ft, 225 pleats, 1-3/4" male slip, must be used with 6CH-942.). Waterway Plastics Service Logic cartridge table on 6CH-941 (Fetched 2026-11-09: 817-0011, 50 sq ft upper cartridge (extension)). Pleatco 2023 Catalog on 6CH-941 (Spec table PDF p.33 and cross-reference PDF p.47: the set PWW100P3-SET covers 817-0011 and 817-0012). Filbur Catalog & Reference Guide on 6CH-941 (Waterway section PDF p.28: FC-0360, OEM 817-0011, 6CH-941).

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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.

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Sources

Not in sources: Per cartridge: 50 (Waterway) vs 45 (Unicel spec) vs 40 (Filbur description). Filbur's Waterway column prints 80. Pleatco rates the pair, not this cartridge alone, at 100 sq ft..