... iron phosphate, aluminum phosphate, magnesium dihydrogen phosphate dihydrate, fluoride acid, fluoride salts, acids and other impurities.Storage and custody matters ... iron phosphate, aluminum phosphate, magnesium dihydrogen phosphate dihydrate, fluoride acid, fluoride salts, acids and other impurities.Storage and custody matters ... , and ventilation should be stacked in a dry calcium superphosphate