Not sure how to measure your filter cartridge?
Check out this guide.
Replaces 6CH-25, PTL-20W-SV-P4, FC-0305
Fits & replaces
This Excel Filters cartridge (XLS-608) is a direct-fit replacement for Waterway Top Load 25 Sq filter systems, cross-referenced with Pleatco PTL20W-SV-P4, Unicel 6CH-25, and Filbur FC-0305. Confirm the part number on your current cartridge — or its diameter, length, and end caps — before ordering.
See the full compatibility list (10) →
Pleatco / Unicel / Filbur equivalents on the cross-reference chart →
Built to OEM dimensions for Waterway Top Load 25 Sq cartridge filter systems, this replacement matches the original cartridge geometry, end-cap style, and media surface area — without the OEM markup. It directly replaces aftermarket Pleatco PTL20W-SV-P4, Unicel 6CH-25, and Filbur FC-0305 part numbers — the full cross-reference list is in the Compatibility tab. Every cartridge is manufactured in our Austin, TX facility, ships free, and is backed by the Excel Filters Perfect Fit Guarantee on its listed cross-references.
The XLS-608 1PACK replacement cartridge is engineered for Sunrise Spas® and built for dependable day-to-day filtration performance. Each cartridge is sized at 6" diameter x 5 1/2" length, with Semi-Circle Handle top and 1.5" Male NPT bottom end caps for direct-fit installation with no housing modifications.
Measure your old cartridge cap-to-cap. A variance of ⅛" is normal — anything larger likely means a different housing model.
Match your filter housing below, click any part number to verify the fit, or paste your existing part number into the search box.
Filter housings and systems this cartridge fits
OEM and competitor cartridge part numbers this product replaces
Can't find your part number? Look it up on the full pool filter cartridge cross-reference chart.
Match the part number printed on your current cartridge against the Compatibility list on this page, or measure the outer diameter, length, and end-cap style and compare them with the Dimensions and Fit tab. A variance of about 1/8 inch is normal — anything larger usually means a different housing model.
It directly replaces PTL20W-SV-P4, 6CH-25, FC-0305, Softub 90-802, Aladdin 12520, Baleen AK-9011, Darlly 60251, Pure N Clean PC-0305, Spa-Daddy SD-00798. This covers the OEM, Pleatco, Unicel, and Filbur cross-references listed in the Compatibility section on this page.
It fits Sunrise 25 sq. ft. top-load spa housing when dimensions match. Always confirm against your housing model before ordering.
No — it is an aftermarket replacement cartridge manufactured by Excel Filters in Austin, TX and built to OEM dimensions and media specs. It is not affiliated with or endorsed by the original equipment manufacturer.
Most pool and spa cartridges last one to two seasons depending on bather load and water chemistry. Rinse the cartridge monthly during heavy use and replace it when cleaning no longer restores flow or the pleats show wear.
First double-check the part number on your old cartridge against the Compatibility list on this page — most fit problems trace back to ordering for a different housing model than the listing covers. If you still have a fit question, contact us at (888) 532-2801 and our team will help you confirm the right cartridge before or after you order; returns are handled under our standard return policy.
XLS-611 1Pack
In stockReplaces 6CH-49, PPG50P4, FC-0314
XLS-406 1Pack
In stockReplaces Unicel C-4607, Pleatco PC-7-120, Filbur FC-3710
XLS-718 4Pack
In stockReplaces R173576, PCC105, Unicel C-7471, Filbur FC-1977
XLS-722 4Pack
In stockReplaces CX875RE, CX880XRE, PA106, C-7488, FC-1226
