POPULAR BRAND REPLACEMENT: Pleatco: PSD125-2000 Unicel: C-8326 Filbur: FC-2780 DIMENISIONS: Diameter: 8 1/2" Length: 19" Top: 2 3/16" Slip Bottom: 2 3/4" hole (beveled edge) Filter Area: 125 sq ft Filter Material: REEMAY(3 oz/yard) Alternate Filter Names: 6540-488 | 6540-501 and 6540-502 combo | 17-175-3230 | 6540-505 | APCC7435 | 22507 | 6473-165 | Sundance MicroClean II | Sundance MicroClean 2 Used in pools / spas made by: Sundance Spas | Sweetwater Spas and other manufacturers