There are the detailed stipulation in GMP Standard for preparation of water ,storage ,distribution . They should be no growth of microorganism and contamination .The material of storage and conveying pipeline should be non-toxic ,anti-corrosion , the design of pipeline and installation should be no dead leg , blind tube .The storage and pipeline should been cleaned ,sterilized regularly . Air vent should been equipped with hydrophobic sterilizing filter . Brief Instruction: There are four type for choice ,such as tree effect, four tree effect , five effect ,six effect , customer can choose which kind of type according to need . The feature of our equipment : 1.More cost ,safer,more effect . 2.Conclusion under specified operation parameters,the quality of water by multi effect still is steady ,reliable . 3.Objective to find out the factors influencing the quality of water by multi effect still ,if according to magnitude of influenced importance is feed water quality ,steam quality ,flow of feed water inlet,flow of the cooling water .