Water Purification, PAM, PAC manufacturer / supplier in China, offering Carbon Source Cod 100W for Improving Biological Activity and Improve The Removal Rate of Total Nitrogen and Ammonia Nitrogen, Coagulant Aids Flocculant Chemicals High Purity for Water Treatment, Low Price Hot Selling Wholesale Price Acidulants Citric Acid Monohydrate Anhydrous and so on.