About this site & our accuracy policy

The wrong filter means a return and a tub sitting dirty for another week, so we'd rather show fewer matches than a wrong one.

The rules

1. Manufacturer sources only. Every dimension, part number and tub-brand listing comes from a filter manufacturer's own published catalog, and each fact links to the PDF page it came from. We don't copy retailer listings or other cross-reference sites.
2. No invented numbers. If a catalog doesn't print it, we don't show it. Blank cells say "not listed".
3. Cross references need a catalog. We list two cartridges as interchangeable only if a manufacturer's cross-reference table says so.
4. Dimension check. We then compare each maker's own published dimensions. If diameters differ by more than 5/16", lengths by more than 3/4", or the end types clearly conflict (an open end versus a handle or closed end), we leave the match out and list it below. Smaller differences stay but are flagged on the page.
5. Shared OEM numbers are flagged. If a catalog prints the same OEM number for two different cartridges, both pages say so.

Sources

• Pleatco 2023 Catalog & Cross Reference Guide (Pentair)
• Unicel 2026 Replacement Guide
• Filbur Product Catalog and Reference Guide (2024)

Matches we left out

• PJW40SC-F2M (not published): Unicel 5CH-402: published length 10-3/4" vs 9-7/8" differs by more than 0.75"; Filbur FC-2811: published length 11" vs 9-7/8" differs by more than 0.75"

Found a mistake?

Filter makers update their catalogs. If your cartridge doesn't match a listing, compare it with the linked catalog page. Corrections will be welcome once a contact address is set up.

Not affiliated with Pentair/Pleatco, Unicel (Meissner Mfg.), Filbur or any spa manufacturer. All trademarks belong to their owners.