If your water has both iron and manganese, or iron and hydrogen sulfide, or iron bacteria, greensand is a very effective approach for removal.
Using potassium permanganate, manganese and soluble iron are oxidized and precipitated by contact with higher oxides of manganese on the greensand granules. The hydrogen sulfide is eliminated by oxidation to sulfate and an insoluble precipitate. Another option is to inject chlorine upstream of the greensand filter oxidizing the iron and/or manganese and allowing it to be removed as a colloid.
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