... sulfate 2,dosage is small, low cost 3,used in waste water treatment 4,quickly delivery 5,factory hot selling Poly ... decolorization, deodorization, dehydration, deoiling, sterilization, removal of heavy metal ions in water, radioactive substances and carcinogens, and strong ability to remove COD ... Value: from 4-11 in which 6-9 is best. The PH Value changes very little after water treatment, and reduces ...