Birm / MTM / Greensand Plus
Greensand is one of the oldest but proven oxidation technologies. Potassium permanganate, itself an oxidizer, is used to regenerate the greensand. In this application, potassium permanganate produces manganese dioxide on the surface of the mineral and — once the water comes in contact with it — any iron is immediately oxidized. The iron can be filtered and then cleaned away in the backwash cycle. Greensand is also effective with low levels of H2S (hydrogen sulfide) and manganese.
MTM stands for Manganese Treatment removal Media. It is a granular manganese oxide andis so in composition very well comparable with MGS. It is much lighter and requires less of a backwash rate than standard greensand.
Birm has the ability to remove iron and manganese and has no effect on hydrogen sulfide. Like manganese dioxide, birm also uses dissolved oxygen as a catalyst and may require some type of pre-oxidation in cases where the dissolved oxygen content is too low to affect a maximum iron removal result.