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The Marathon 5 x 13 R is a compatible replacement for the following pool filter cartridges:
The Marathon Spas Comp Pool and Spa Filter Replacement is a pool water filter constructed with a media area of 50 square feet. This compatible Marathon Spa filter replacement is constructed with Open 2 1/8" top/bottom styles, and measures 4 15/16" x 13 5/16". This spa filter replacement reduces contaminants in swimming pool and spa water.