Product Description Pool/Spa Filter Cartridge Pleatco PWK65 Replaces Unicel C-8465/Filbur FC-3960/Watkins Hot Spring Spas upgrade from PWK45N Pleatco replacement pool / spa pool filter cartridge # PWK65 replaces Unicel C-8465, Filbur FC-3960, and Watkins Hot Spring Spa update PWK45N pool / spa filter cartridges. Pleatco flow filter cartridges used nuclei free premium, designed specifically to allow the flow of water uniformly throughout the filter cartridge increases (most efficient), use the means of surface to inhibit the growth of bacteria, mold and algae (better quality water), and makes it easier for the pump to get more water through the cartridge (less wear and expenditure).
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