GLB Filter Cleanse is a multi-purpose granular formulation that cleans and unclogs filters from grease, oils, and scale. This product works great on all types of swimming pool filters (sand, cartridge or D.E. filters). Filter Cleanse is a unique combination of acids and detergents which allows you to remove all filter contaminants with one product. It is compatible with chlorine, bromine, mineral purification systems, salt water pools, ozone, and biguanide sanitizers.