Pot Perm iron filter regenerant from Pro Products converts iron and manganese into an insoluble oxide making it easy to filter out of your water and to maintain the performance of your greensand iron filter. At room temperature (68°F), eight ounces of dry Pot Perm Plus will dissolve in one gallon of water. For every cubic foot of softener filter media, it is recommended to use 2-4 ounces of dry Pot Perm Plus. It can be applied directly to the filter or dissolved in water before adding it as a solution. Order the Pro Products Pot Perm Free Flow iron filter regenerant today.