Polyaluminium chloride normal service life is how long? In our country, since the 1960s, the research and application of polyaluminum chloride has been started. It is one of the earliest countries in the world to develop polyaluminum chloride. During the Cultural Revolution, the research was interrupted. After 1970, China Science and Technology Institute and Sichuan Water Supply and Drainage Design Institute to resume this research work, in 1973, the State Construction Commission held a national symposium on the new type of flocculant technology in Chengdu, affirmed the technical and economic effect of Poly aluminum chloride and development direction, proposed to expand the raw materials. Popularization and other tasks to develop a tentative standard for product quality, but by the 1980s, producers and researchers have obviously felt that the use of waste acid, alkali as the raw material is difficult to produce high-quality polyaluminum chloride, which turned to the international epidemic Process studies, using aluminum hydroxide as raw material, hot-melt one-step hydrochloric acid and spray drying method prepared high-grade polyaluminum chloride. Polyaluminum chloride production process is divided into atmospheric and pressurized processes, atmospheric pressure process equipment is simple, investment in the province, but the reaction time is long, low degree of automation, labor intensity, product purity is low, the domestic use of this method, the pressure High technology requirements, high technology content, large investment, but the reaction time is short, high degree of automation, low labor intensity, high product purity, the domestic most commonly used atmospheric pressure reactor is the most common type K, the normal life of only three Month, then use the surface lining of acid-resistant cement pool, the normal life of up to 5 years.