A mineral material (glauconite) that looks like ordinary filter sand except it is green. It is treated with potassium permanganate and is used to remove iron, manganese, and hydrogen sulfide from groundwater.
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A mineral material (glauconite) that looks like ordinary filter sand except it is green. It is treated with potassium permanganate and is used to remove iron, manganese, and hydrogen sulfide from groundwater.
