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Sundance OEM 6540-490 spa filter (C-8325)
Listed for: Sundance Universal Length
Fits Sundance OEM 6540-490 cited
Ø 8-7/16"L 18"125 sq ft| Unicel | C-8325 |
|---|---|
| Pleatco | PSD125U |
| Filbur | not sourced |
| Top | closed w/ 3-step edge |
| Bottom | 2-1/2" / open w/ beveled edge |
Retailer search links — see disclosure. Verify dimensions before ordering.
Source note: Replaces 18"-18-1/2" OAL; also replaces discontinued C-8320 (OEM 6540-482)
How to confirm this is your filter
Pull your current cartridge and measure it end to end, including any handle, and across the widest point of the pleats. This cartridge measures 8-7/16" in diameter and 18" long, with a closed w/ 3-step edge on top and a 2-1/2" / open w/ beveled edge on the bottom. The bottom fitting matters most: a cartridge with the right diameter but the wrong thread or open-end size will not seal in the filter housing, letting unfiltered water bypass the media.
The 125 sq ft rating describes the pleated media area. Sundance housings are designed around a particular cartridge, so choose a replacement with the same size and fittings rather than a larger area rating. Unicel C-8325 and Pleatco PSD125U are cross-referenced to each other in the Pleatco 2023 catalog, so either should fit the same housing.
Similar-diameter Sundance cartridges
- C-8326 cartridge (OEM 6540-488) — 8-7/16" × 19"
- C-8327 cartridge (OEM 6540-488) — 8-7/16" × 19"
- C-8380 cartridge (OEM 6540-501) — 8-7/16" × 14"
Sources
- Unicel 2026 Replacement Guide — OEM Cross Reference, PDF p.58; spec table PDF p.19 (PDF)
- Pleatco 2023 Catalog — Unicel-to-Pleatco cross reference, PDF p.43 (PDF)
Not in sources: Replaces 18"-18-1/2" OAL; also replaces discontinued C-8320 (OEM 6540-482); no Filbur equivalent sourced; no model-year range in source.