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The CMP 303557 R is a compatible replacement for the following spa filters:
The Custom Molded Products 303557 Comp. Spa Cartridge is a pool filter cartridge measuring 4 15/16" x 9 1/4" with 2 1/8" Open top & bottom styles. This compatible Custom Molded filter features 35 square feet of media area for the reduction of waterborne contaminants.