Our 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 mainland. The products have passed the ...