LeisureTime Filter Clean 16 oz Filter Clean New and Improved Concentrated formula deep cleans filter to remove dirt, oil, grease and scale. Features: Use for cartridge, sand or DE filters Removes oil, grease, dirt and soap Works overnight Applications: 3-Month Cleaning: 1. Remove grids or cartridges from filter. 2. In a clean, plastic pail, bucket or trash can that contains 8 gallons of water, add contents of FILTER CLEAN. (This is enough solution to clean 110 square feet of filter area.) 3. Place cartridge or grids upright in solution. 4. Soak for a minimum of 3 hours. For maximum effectiveness, soak overnight. 5. Remove filter from solution. Hose off filter with high pressure nozzle and replace. Tips: Filters should be cleaned every three months or as needed. For maximum benefit, allow catridge to dry before reinstalling. Compatible With: Chlorine, bromine and biguanide sanitizers.