Changzhou Yao's Tongde chemical Co., Ltd. is share cooperation corporation, establish in 1997, it is a high-tech corporation of a AAA grade, We have always been engaged in the research, development, production and application of the water treatment drug. Our company is technical rich, the production technology is advanced,and the detection method is perfect.There is many one that specializes in the technical staff of water treatment and a large amount of high- new and advanced water treatment eq...