... manganese sand filter media. Rough appearance, brown color, can remove the Manganese and Ferrum in the water, very useful ... 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 ...