It’s measured by Institute of Environmental Health Monitoring(IEHM),Chinese Academy of Preventive Medicine(CAPM)that the water quality has reached not only national sanitary for drinking water of China but also such standard of WHO,USA and EC. Length: 5 inch,10 inch,20 inch Outside diameter:30Φ,40Φ,45Φ,50Φ,60Φ,70Φ,90Φ,100Φ. Inside diameter:10Φ,12Φ,15Φ,20Φ,25Φ,30Φ,40Φ,50Φ. Precision:0.1μm--50μm Shape: outside and inside diameter and height can be fixed by made-to-measure on the requirements of users. Applications: 1.remove three organic pathogenic substances 2.remove iron and manganese 3.remove phenol 4.reduce hardness 5.remove turbid substance, gelatinous substance and iron rust 6.remove color, smell and chlorides 7.remove nitrite 8.remove fluorine 9.remove arsenic 10.remove lead and mercury 11.remove ammonia nitrogen