... Sodium Sulphate Anhydrous min 99%, White content purity min 88%, Industrial Grade, PH value:6-8 About us : Qingdao Central Chemical Co ... Sodium sulfate , Cryolite , Soda ash , Edible alkali, Polyaluminium Chloride, Polyacrylamide, Polyaluminium Ferric Chloride ,Polymerization iron sulfate , potassium sulfateand Sodium Tripolyphosphate . And our ...