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The Purex R173581 R is a compatible replacement for the following pool filter cartridges:
The Purex R173581 Comp. Replacement Pool & Spa Filter is a pool water filter built with premium media and 120 square feet of media area for the reduction of unwanted contaminants in water. This compatible Purex filter measures 8 7/8" x 19 1/2" with top & bottom styles measuring 4" Open.