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Replaces C-8326, PSD125-2000 and FC-2780
Fits & replaces
This Excel Filters cartridge (XLS-831) is a direct-fit replacement for Sundance Spas 6540-488 filter systems, cross-referenced with Pleatco PSD125-2000, Unicel C-8326, and Filbur FC-2780. Confirm the part number on your current cartridge — or its diameter, length, and end caps — before ordering.
See the full compatibility list (15) →
Pleatco / Unicel / Filbur equivalents on the cross-reference chart →
Built to OEM dimensions for Sundance Spas 6540-488 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 PSD125-2000, Unicel C-8326, and Filbur FC-2780 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-831 1PACK replacement cartridge is engineered for Sundance and built for dependable day-to-day filtration performance. Each cartridge is sized at 8 7/16" diameter x 19" length, with 1.5" Slip Fit top and 2.5" Open w/ Bevel Edge 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 6540-488, PSD125-2000, PSD125-2000-M, C-8326, C-8326RA, FC-2780, FC-2780M, Aladdin 22507, Baleen AK-70013, Darlly 81252, Magnum SU125, Pure N Clean PC-2780, Spa-Daddy SD-00231, Spa-Daddy SD-01122. This covers the OEM, Pleatco, Unicel, and Filbur cross-references listed in the Compatibility section on this page.
It fits Sundance 120/125 double-end filter housing using 6540-488 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-718 4Pack
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XLS-722 4Pack
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XLS-705 4Pack
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XLS-780 4Pack
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