... min. About us : Qingdao Central Chemical Co., Ltd. locates in Qingdao,the beautiful seaside city ,which ... Cryolite , Soda ash , Edible alkali, Polyaluminium Chloride, Polyacrylamide, Polyaluminium Ferric Chloride ,Polymerization iron sulfate , potassium sulfateand Sodium ... technical developers specializing in the research of those chemicals.With the consistent quality ,reliable technical performance ...