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The Waterway 817-1000 R is a compatible replacement for the following spa filter cartridges:
The Waterway 817-1000 Comp Pool & Spa Filter Cartridge is a pool filter replacement that measures 4 15/16" x 23 5/8" with 2 1/8" Open top & bottom styles. This compatible Waterway filter offers premium media and 95 square feet of area with 3 oz. of weight. Maintaining clean and clear water is easy with this pool and spa filter.