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Give it purpose - fill it with water filters, air filters, refrigerator filters, and more.
Note: Fits Bullfrog spas built prior to 2013.
The Bullfrog 50 SF R can replace the following filter cartridges:
The Bullfrog 50 Square Foot Comp. Pool and Spa Filter is a replacement pool filter cartridge that measures 8" x 5 3/4". Featuring a top handle and SAE bottom threads, this compatible Bullfrog pool filter features 50 square feet of media filtration fabric to improve water quality and clarity in swimming pools and spas.