This sand filter cleaner from Bio-Dex cleans and recharges Zeobrite filter media while also removing scale and oils. Dosage: 1 quart for filters up to 24", 2 quarts for filters 30" to 36". This pool filter cleaner for sand filters cleans and recharges ZeoSand filter media. It quickly removes scale and oils to extend filter cycles and the life of your ZeoSand media.