SINGLE ANTIMICROBIAL BLUE FILTER MADE IN THE USA NOTE THESE ARE Antimicrobial/ MICROBAN FILTERS DOESN'T PROMOTE BACTERIA GROWTH Pleatco: PWK65 | Unicel: C-8465 | Filbur: FC-3960 • Diameter: 8 1/2''; • Length: 10 1/2'' • Top: Open Hole: 3'' • Bottom: Open Hole: 3'' • Filter Area: 65 sq ft • Filter Material: MICROBAN (3 oz/yard) Alternate Filter Names: 31114 | 71827 | APCC7215 | 16506 | Used in pools / spas made by: Hot Springs Spas | Tiger River Spas | Watkins Mfg. and other manufacturers