PAC (Poly Aluminium Chloride) is a highly effective chemical compound which is widely used in water treatment application for the coagulation and disinfection to make it reusable. It is highly beneficial for the removal of anionic colloidal impurities during clarification of sewage, industrial effluents and drinking water. It also helps to remove the total organic carbon and residual color. The compound is available in powdered form with a good solubility in water and generates vey less waste sludge.