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The Purex R173582 R is a compatible replacement for the following spa filter cartridges:
The Purex R173582 Comp. Replacement Pool & Spa Filter is a pool water filter that improves swimming pool & spa water clarity through premium media 175 square feet of media area. This compatible Purex filter measures 8 7/8" x 39" and is constructed with 4" Open top & bottom styles.