ProTeam Filter Magic is a professional strength filter cleaner for pool and spa. 1 quart bottle Can be used on sand, cartridge and diatomaceous earth swimming pool filters Complex formula contains wetting agents, surfactants, cleaning compounds and release agents Quickly loosens and removes oils, combined organic matters and calcium deposits Can be used as a backwash or as a soak cleaner Compatible with ALL types of sanitizers Will not affect swimming pool or spa chemistry Prevents cloudy swimming pool and spa water Improves pool and spa water clarity Helps protect pool and spa equipment Biguanide filters retain full efficiency Quick Clean; Sand Filter: Turn off inlets for all chemical feeders With pump running and filter in the backwash position add 6 - 16 ounces through the skimmer Optional Sand Filter Cleaning: Add directly into the filter media, let soak for 4 hours or longer After soaking, start pump with filter in the backwash position Quick Clean Cartridge and DE Filters: Remove media from filter and spray from top to bottom Allow to stand for 5 minutes Rinse thoroughly with a hose and replace for normal operation Optional Cartridge and DE filters cleaning: Add 16 ounces of Filter Magic to 2.5 gallons of fresh water Remove media from filter and soak in solution for 30 minutes or longer Remove and rinse DO NOT use in steel, aluminum, or metal containers This product is considered a "hazardous material," is air-restricted and cannot be shipped to Alaska or Hawaii. All Chemical sales are final.