Acid Neutralizing Filter | Acid Neutralizer - Pure Flow WaterAcid Neutralizing Filter uses Calcite (calcium carbonate), a naturally occurring mineral, or a mix of Calcite and Corosex (magnesium oxide), another naturally occurring mineral, to raise the pH of acidic water and neutralize its corrosive characteristics. In addition to protecting pipes, plumbing fixtures and appliances, this filter also facilitates the removal of iron and manganese by raising the pH and enabling the use of an iron filter.