Clack MTM is an alternative to Manganese Greensand for the removal of iron, manganese and hydrogen sulfide. Must be regenerated with potassium permanganate.
Clack MTM is a granular manganese dioxide filtering media used for reducing iron, manganese and hydrogen sulfide from water. Its active surface coating oxidizes and precipitates soluble iron and manganese. Hydrogen sulfide is oxidized to a sulfur. The precipitates are filtered out in the granular bed and removed by backwashing.