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The Purex 178571 R is a compatible replacement for the following spa filter cartridges:
The Purex 178571 Comp. Pool and Spa Filter Cartridge 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.