The printing and dyeing industry is an industry with a large proportion of sewage treatment. Printing and dyeing wastewater is the wastewater discharged from printing and dyeing factories mainly processing cotton, hemp, chemical fibers and their blended products. Due to the large amount of impurities, large chroma and high organic content in the printing and dyeing sewage, it is necessary to use polyaluminum chloride, polyacrylamide and activated carbon to cooperate.

Polyaluminum chloride is a new water purifier in the market in recent years, with a large amount of water purifying agent. Industrial grade polyaluminum chloride is mostly yellow and tan particles, and the content is below 28%.

Polyaluminum chloride for drinking water, also known as polyaluminum chloride for water companies, is light yellow or yellow-white powder. All indicators have reached GB15892-2009 purification treatment of drinking water. After being filtered by various material filter plates, the content of water intolerant is greatly reduced, and the 10% aqueous solution is light yellow transparent liquid. It can ensure the smooth flow of the user's pipeline and improve the utilization rate of drugs, which cannot be achieved by the natural sedimentation method. In addition to less water-insoluble matter, the content of heavy metals and other harmful substances is also very small, so this product is unanimously recommended.