This 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. Fill plastic pail with water to cover the cartridge. Soak a minimum of 3 to 6 hours. Remove cartridge and hose off with a high-pressure nozzle. Compatible with chlorine, bromine, ozone and biguanide sanitizers. Product contains 32-ounce per bottle. Includes 12 pieces per pack.