General Secretary Xi emphasized that 'lucid waters and lush mountains are golden mountains and silver mountains'. With the development of industry, the environment in which people live is getting worse and worse. Environmental protection is an obligation that each of us should fulfill.Many manufacturers choose polyaluminum chloride to treat sewage, river water, reservoir water, groundwater, urban sewage, industrial water purification, recovery of useful substances in various industrial wastewater and waste residues, polyaluminum chloride is also used in sugar refining, Pharmaceutical refining, cement quick-setting, cosmetic raw materials and other industries.With the wide application of polyaluminum chloride, many customers do not know how to choose polyaluminum chloride that meets the quality standards. In fact, there are three selection criteria for polyaluminum chloride: alumina content, basicity and pH value.1. Look at the alumina content. The alumina content is a measure of the active ingredients of the product. It has a certain relationship with the relative density of the solution. Generally speaking, the higher the relative density, the higher the alumina content.According to the content of aluminum oxide in the composition, it can generally be divided into 30