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SpiroPure pool and spa filter cartridges offer long-lasting, durable filter media with high dirt holding capacity for clear, sparkling water in your pool or hot tub spa. A strong inner core means increased strength without hindering water flow or filtration performance. Anti-microbial end caps resist growth of bacteria or mold.SpiroPure SP-PS-3960 Specifications:Diameter: 8-1/2” (8.5”)Length: 10-1/2” (10.5”)Top Hole: 3”Bottom Hole: 3”Top Style: OpenBottom Style: OpenMedia Area: 65 sqftA compatible high quality replacement for pool & spa filters by Pleatco PWK65 / PWK65-M, Unicel C-8465 / C-8465RA, Filbur FC-3960 / FC-3960M, Hot Springs Watkins 65, and more!