Polyaluminium chloride water purification agent for sewage treatment is the best PH value? Polyaluminum chloride manufacturers PAC PAC before doing sewage treatment, polyaluminum chloride manufacturers said the first PH value before sewage treatment to make a reasonable adjustment. And no matter what kind of sewage, if you want to use the PAC, you must first reduce the PH value to about 7, then add PAC when the sewage treatment works best. This is one of the main reasons that affect the PAC effect of purifying agent. pH value is mainly indicative of water-based acid-base, the general pH value of printing and dyeing wastewater to reach a high of about 12, so that the higher alkaline sewage first PH value of the sewage down to about 7. Because the water is too alkaline. The higher the PAC solution, the higher the acidity. 10% PAC solution PH value is about 1.0. And the use of water purifier PAC conditions must be used in neutral water, PH below 5.6, higher than 8.0 are not available, no effect.