Application:
Aluminium sulfate is used in water purification and for chemical phosphorus removal from wastewater. It causes suspended impurities to coagulate into larger particles and then settle to the bottom of the container (or be filtered out) more easily. This process is called coagulation or flocculation.
It has been used as a method of eutrophication remediation for shallow lakes. It works by reducing the phosphorus load in the lakes.