Water use PAC adjust the pH of the process description method in which the pH of the water treatment field is an important value, adjusting for all types of wastewater treatment, and ultimately, is pH. Currently, industrial waste water is also divided into two types of acid with alkali treatment, we referred to as acid waste. Such waste due to its nature of acids and bases, there are highly corrosive, but also with the process for dealing with interference will affect the quality of the treatment effect, which, in recent years, people used to be treated materialized law to regulate water quality pH, mainly deal with the use of chemical additives dosing. Physico-chemical treatment of wastewater using PAC pH effect: PAC due to the very wide range of pH adaptation, so in recent years, often as a regulator of industrial waste water treatment additives acid. PAC is mainly in use, will not be affected by the pH of the water, with a strong adsorption capacity and dewatering performance, and for the removal of pollutants in the water is high, the majority of users of the popular praise.