Natural manganese sand iron is a contact catalytic iron removal process, suitable for groundwater iron content is less than 20mg / L of iron. Natural manganese sand containing water of high manganese can divalent iron to trivalent iron oxide, while the catalytic surface is formed of the "active membrane", to further enhance the effect of removing iron. Iron water through aeration, and only after a natural manganese sand filter, will be able to complete all the process of iron removal. Manganese sand filter is the choice of lump ore and natural sand as raw material, crushing screening processed. Appearance of rough, brown, natural manganese sand containing MnO2, it is the oxidation of Fe2 + to Fe3 + excellent catalyst, manganese content (with MnO2, the same below) not less than 35% of the natural manganese sand filter, both for groundwater in addition to iron, but also for groundwater manganese; manganese content of 20% to 30% of natural manganese sand filter, it should only be used groundwater in addition to iron and manganese content is less than 20% should not be used. North Branch Green Clean Technology Co., Ltd. produces manganese sand filter is the use of domestic quality, grain density, mechanical strength, chemical activity, not broken, do not dissolve in water, natural manganese ore. After washing polishing cleaning, drying, magnetic separation, screening, dust and other technology into the sand. Manganese sand then processed by a certain gradation blending. It has a water filter ideal grading scale, it has the largest volume in the unit specific surface area, the strongest interception capacity of the largest and smallest catalytic oxidation backwash churn. It looks dark brown, nearly round, the main ingredient is manganese dioxide content of between 35% -45%. Use it to treatment of groundwater, simple process, easy operation, small footprint, low construction cost, long-lasting stability, more than 5 years service life, easy to manage, do not add any chemicals to fill up removal of iron, manganese, arsenic The purpose of such harmful substances, water quality fully meet the national drinking water standards, is a very good groundwater treatment.