... is mainly used for groundwater eliminatethe manganese filter, as manganese form of filter materials mainly manganese dioxide.Using manganese and iron in water purification, the ... Sulphate,Ferrous Sulphate,Coalbased Activated Carbon,Coconut Shell Activated Carbon,Woodbased Activated Carbon,Anthracite Filter Media,Walnut Shell Filter,Manganese Sand Filter,Quartz Fiter ...