Pool Filter Lab

Cartridge record

Unicel 4CH-23

Also sold asPleatco PFF25TC-P4Filbur FC-2400OnCore OC-506C

cross-checked against 3 sources

Verified specifications

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

Cartridge specifications
Outside diameter4-15/16"
Source values
  • unicel 4-15/16"
  • pleatco 4-5/8"
Length6-5/8"
Source values
  • unicel 6-5/8"
  • pleatco 6-5/8"
Top cap/ closed
Source values
  • unicel / closed
  • pleatco Closed
Bottom cap/ 1-1/2” male thread/MPT
Source values
  • unicel / 1-1/2” male thread/MPT
  • pleatco P4
Pleats212
Source values
  • unicel 212
Filter area25 sq ft
Source values
  • unicel 25
  • pleatco 19
Media weight3 oz
Source values
  • unicel 3
  • pleatco 3

Equivalent part numbers

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

Cross-reference equivalents
BrandPart numberVerification
Unicel4CH-23cross-checked against 3 sources
PleatcoPFF25TC-P4cross-checked against 2 sources
FilburFC-2400single-source
OnCoreOC-506Csingle-source

Known equipment fits

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

Filter and spa fitments
BrandModelOEM partSource
Freeflow SpasFreeflow Lagas Claro—pleatco single-source
RLXCLX—unicel single-source
Unicel25 sq.ft. top load—unicel single-source

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-4316

4-15/16" × 5-1/2"

single-source

C-4401

4-15/16" × 4-5/8"

cross-checked against 3 sources

4CH-935

4-15/16" × 9-1/4"

cross-checked against 2 sources

C-4335

4-15/16" × 9-1/4"

cross-checked against 3 sources

C-4328

4-15/16" × 9-13/16"

single-source

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