"Manganese Greensand is formulated from glauconite greensand, a naturally occurring mineral, which is capable of reducing iron, manganese and hydrogen sulfide from water through oxidation and filtration. When the oxidizing capacity of the media is exhausted, it is regenerated with a weak solution of potassium permanganate (KMnO4). The media also offers advantages such as no or low attrition for a long service life and no harmful effects from a chlorine feed. The optimum operating conditions are 26.5 C and a pH range between 6.2 and 8.5.'
