Robarb 20581A Pool EZ Filter Cleaner, 32-Ounce E-Z filter cleaner low-foam formula cleans dirt, organics, oil, grease, soap and minerals from cartridge filter to restore maximum efficiency Remove the cartridge filter, rinse off heavy debris and submerge in a plastic pail Add 8-ounce for each 50 square feet of cartridge filter area Compatible with chlorine, bromine, ozone and biguanide sanitizers Contains 32-ounce per bottle