Pool Filter Lab

Cartridge record

Unicel C-6600

Also sold asPleatco PWK25Pleatco PWK40Filbur FC-3930OEM 31115

cross-checked against 2 sources

Verified specifications

The selected value is shown first. Expand any row to compare the source values retained by the dataset.

Cartridge specifications
Outside diameter6-3/8"
Source values
  • unicel 6-3/8"
  • pleatco 6-1/4"
Length11-7/8"
Source values
  • unicel 11-7/8"
  • pleatco 11-7/8"
Top cap3" / open
Source values
  • unicel 3" / open
  • pleatco 3
Bottom cap3" / open
Source values
  • unicel 3" / open
  • pleatco 3
Pleats207
Source values
  • unicel 207
Filter area45 sq ft
Source values
  • unicel 45
  • pleatco 25
Media weight3 oz
Source values
  • unicel 3
  • pleatco 4

Equivalent part numbers

Match the complete printed string. Similar-looking part numbers can describe different end caps or lengths.

Cross-reference equivalents
BrandPart numberVerification
UnicelC-6600cross-checked against 2 sources
PleatcoPWK25single-source
PleatcoPWK40single-source
FilburFC-3930single-source
OEM31115single-source

Known equipment fits

Fitments are source-attributed. Confirm the housing model and cartridge measurements before ordering.

Filter and spa fitments
BrandModelOEM partSource
Hot Springs Spas—31115unicel single-source
Hot Springs Spas——unicel single-source
Watkins / Hot Springs SpasWatkins 45—pleatco single-source
Watkins / Hot Springs SpasWatkins Hot Spring Spas—pleatco single-source

Browse related equipment

Source notes

Dimension neighbors

Records with the same outside diameter and a different length appear first, followed by the closest diameters. End-cap details still need to match.

C-6324

6-3/8" × 5-1/8"

single-source

C-6610

6-1/4" × 8"

cross-checked against 2 sources

C-6616

6-1/4" × 8"

cross-checked against 2 sources

C-6620

6-1/4" × 8"

cross-checked against 2 sources

C-6617

6-1/2" × 17"

cross-checked against 2 sources

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