... ferrum in water treatment via manganese dioxide. Firstly, use a so called film membrance filter, because oxidation take place ... gray, commonly used in drinking water’s filter devices to remove iron, manganese , water treatment effect is very good. ( ... manganese, MnO2 ≤ 30%,can only be used for remove iron from ground water).SpecificationItemTest dataItemTest dataMnO225-45Specific gravity3.4SiO217-20Bulk ...