About MySpaFilter

MySpaFilter is an independent reference for matching a hot tub filter cartridge to its replacement. Spa owners usually know their tub's brand and can read a part number off the old cartridge, but retailers list the same cartridge under several different numbers. This site puts the manufacturer (OEM) part number next to its Unicel and Pleatco equivalents, along with the measurements you need to confirm fit.

Where the data comes from

Each cartridge page lists the publications it is based on, with page numbers: the Unicel 2026 Replacement Guide (OEM cross-reference and spec tables) and the Pleatco 2023 catalog (Unicel-to-Pleatco cross-reference). We don't make up part numbers or model years. When the sources don't give a model-year range or a Filbur equivalent, the page says so instead of guessing.

Verified vs. unverified entries

An entry is marked verified when its numbers and dimensions come straight from the cited pages. Entries we couldn't fully confirm, for example because no second source was found or the source listing is ambiguous, still appear but carry a visible unverified label. Measure your old cartridge before you buy one of those.

How the site is funded

Retailer links can earn us a commission. That never changes the cross-reference data. See the affiliate disclosure. Questions or corrections: contact us.