Excel Filters XLS-831 Replacement Filter Cartridge for Sundance Spas 6540-488 — 1-Pack
Compatible Replacement for Sundance 6540-488. Cross-References Pleatco PSD125-2000, Unicel C-8326 and Filbur FC-2780.
SKU XLS-831 1PACK · UPC 810625020525
Confirm your fit
- Your housing — Sundance 120/125 double-end filter housing using 6540-488.
- Your old part number — 6540-488, PSD125-2000, PSD125-2000-M, C-8326, C-8326RA. See all 15 compatible parts →
- Your measurement — 8 7/16" diameter, 19" height, 1 1/2" Slip Fit top cap and 2 1/2" Open w/ Bevel Edge bottom cap.
Built to OEM Spec, Engineered to Clean®
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 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 once. Order with confidence.
Measure your old cartridge cap to cap, then across the widest pleat.
How to measure a cartridge →Measuring your old cartridge
- Length — cap to cap, with both end caps included.
- Diameter — across the widest point of the pleats, not the end cap.
- End caps — whether each end is open or closed, and the size of any opening.
A variance of ⅛" is normal. Anything larger usually means a different housing model — check the number printed on your old cartridge against the compatible parts list before ordering.
Check compatibility by system or part number
Match your filter housing below, click any part number to verify the fit, or paste your existing part number into the search box.
Fits These Systems
Filter housings and systems this cartridge fits
Replaces These Part Numbers
OEM and competitor cartridge part numbers this product replaces
The Perfect Fit Guarantee applies to the cross-references listed here. Brand names, models and part numbers identify compatibility only. If your housing is not listed, reach out to our team before ordering.
Can't find your part number? Look it up on the full pool filter cartridge cross-reference chart.
What pool pros and homeowners are saying
Fit, replacement & ordering
Still unsure after reading these? Send us the number stamped on your old cartridge and we will confirm the fit.
How do I confirm this cartridge fits my system?
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 Specifications tab. A variance of about 1/8 inch is normal — anything larger usually means a different housing model.
Which part numbers does this cartridge replace?
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.
Which filter systems does this cartridge fit?
It fits Sundance 120/125 double-end filter housing using 6540-488 when dimensions match. Always confirm against your housing model before ordering.
Is this a genuine Sundance part?
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.
How often should I replace my filter cartridge?
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.
What if it does not fit my housing?
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.
*Perfect Fit Guarantee applies to the OEM and aftermarket cross-references listed on this page; brand names, models and part numbers identify compatibility only. We ship to the 48 contiguous United States only; free standard shipping applies to those orders with no order minimum, and expedited service is priced at checkout. Every cartridge carries a 6-month limited warranty against defects in materials and manufacturing, separate from our 30-day return policy.