Trisodium Phosphate(TSP) have two types: Tech Grade and Food Grade.The main content of both types are 98% min. About us : Qingdao Central Chemical Co., Ltd. locates in Qingdao,the beautiful seaside city ,which engages in the manufacturing and marketing of Sodium sulfate , Cryolite , Soda ash , Edible alkali, Polyaluminium Chloride, Polyacrylamide, Polyaluminium Ferric Chloride ,Polymerization ...