Main products: Ferrous Sulphate Heptahydrate , Ferrous Sulphate Monohydrate, Polymeric Ferric Sulfate, Aluminum Sulfate, Polyaluminum Chloride, Polyacrylamide, Flocculant, Retention Aid, Dewatering Agent, etc.Shenzhen Changlong Technology Co., Ltd is one of the biggest professional environmentally friendly pharmaceutical manufacturers and sales enterprises in China and some of its products have occupied nearly 90% of the market in southern part of China. The products own ISO9001:2008 certification and have gone through scrupulous tests like SGS, MSDS and COA,.Every type of product is with good quality and in competitive price. We sell about 30000 metric tons of Ferrous Sulfate, 20000 metric tons of Polymerric Ferric Sulphate and more than 7000 metric tons of aluminum sulfate per month and have already registered "Qingyuan" as our brand name for the leading product Ferrous Sulphate and every month export tons of these products to USA, Australia, Vietnam, India, Indonesia and Middle East, etc. We do business in good faith and sincerely hope to save cost for every customer and potential buyers. As we provide products in high quality and good service, we have gained high reputation among clients both at home and abroad. The Company owns about 50 Engineers and 4 senior University professors who can provide professional and technical guidance for customers. Our aim is to help customers optimize the sewage treatment process and reduce costs, save energy so as to gain both environmental and social benefit in return."Be responsible, diligent, dedicated, and progressive for customer" is our spirit and making products in best quality and competitive price are our surviving advantage .Welcome to visit us.