Polymeric aluminum chloride water treatment agent for a variety of water quality are very strong Poly aluminum chloride manufacturers PAC as a water treatment agent for a variety of water adaptability is very strong for the high turbidity water coagulation and sedimentation effect is particularly significant . Purified water better than inorganic coagulants such as aluminum sulfate, water purification costs compared with low 15-30%. Floc formation quickly, settling speed. Containing high alumina, dosage is small, can reduce the cost of making water. PH value of the source water can be condensed in the range of 5.0-9.0. Polyaluminum chloride manufacturers corrosive small, good operating conditions, solubility better than aluminum sulfate. Salt treatment less water, is conducive to ion exchange treatment and water preparation. Poly aluminum chloride manufacturers adaptability of source water temperature is better than inorganic coagulant such as aluminum sulfate, the effect of low temperature water treatment is also better, the minimum precipitation temperature of -18 ℃. The survey shows that in the past 50 years the precipitation, evaporation and sunshine of the Yangtze River source area have not obvious changes. The annual average temperature in the source region of the Yangtze River has risen slowly since the 1960s. The temperature has risen rapidly in the past 10 years and the average temperature has increased compared with that in the 1960s 1.42 ° C. Based on the remote sensing data of the past years, the Yangtze River Conservancy Commission analyzed the changes of the glaciers in the source regions of the Yangtze River by combining with on-the-spot investigation and concluded that the glacier area is generally in a state of retreat with some fluctuations. The shrinkage rate was relatively rapid before 2004, Slower; in 2009 the total area of ​​glaciers reduced by 126.33km2 on the basis of 1977, the total area decreased by 11.8%.