Check the listing for details. Pro Pot Perm Plus KP02N Potassium Permanganate Free Flow 28 Oz. Jug KP02N. Color: Silver, Condition: New. Listed at 24.82 USD. Pro Pot Perm is an iron filter regenerant and a strong oxidizing agent that converts dissolved iron and/or manganese to insoluble oxides which can easily be removed through filtration. Maintains Performance of Greensand Iron Filters. As an iron filter regenerant, Pot Perm regenerates and oxidizes greensand iron filter media, restoring the exchange capacity of the unit. The "Free Flow" grade has a silicon dioxode additive that keeps the product flowing easily in high moisture environments. New and More Effective Formula. This new formula is more soluble and more effective in converting dissolved iron and/or manganese to insoluble oxides which can easily be removed through filtration. Composed NSF Certified Material.