Pool Filter Lab

Cartridge record

Unicel 4CH-252

Also sold asPleatco PMA20-F2MOnCore OC-408QOEM FIL11100303OEM X268521

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 diameter4-5/8"
Source values
  • unicel 4-5/8"
Length8"
Source values
  • unicel 8"
Top cap/ molded cone handle
Source values
  • unicel / molded cone handle
Bottom cap/ 2” male thread/MPT
Source values
  • unicel / 2” male thread/MPT
Pleats213
Source values
  • unicel 213
Filter area25 sq ft
Source values
  • unicel 25
Media weight3 oz
Source values
  • unicel 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-252cross-checked against 2 sources
PleatcoPMA20-F2Msingle-source
OnCoreOC-408Qsingle-source
OEMFIL11100303single-source
OEMX268521single-source

Known equipment fits

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

Filter and spa fitments
BrandModelOEM partSource
Cal Spas—FIL11100303unicel single-source
Cal Spas——unicel single-source
Coleman Spas—FIL11100303unicel single-source
Master SpasClarity Spas 415—unicel single-source
Master SpasContractor Series 415X268521unicel single-source
Master Spas——unicel single-source
Unicel25 sq.ft. top load—unicel 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.

4CH-925

4-5/8" × 7-1/4"

cross-checked against 2 sources

4CH-20

4-5/8" × 6-3/4"

cross-checked against 3 sources

4CH-920

4-5/8" × 6-3/4"

single-source

C-4303

4-5/8" × 6-3/4"

cross-checked against 2 sources

4CH-24

4-5/8" × 9-3/4"

cross-checked against 3 sources

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