I had a dual cartridge system which failed, so it was replaced with this one. I should have went bigger. Cleaning cartridges are a pain in the rear. My advise is to size up from whatever it calls for to lessen frequency of cleaning. This unit is well made and does exactly what it was designed to do. Hayward C12002 Star-Clear 120-Square-Foot 2-Inch FIP Pipe Pool Filter - Pool Filter Pump - Pool Warehouse'
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