The content of AL2O3 is high, 30% of the base degree is low, only 50%, and the base degree of ordinary polyaluminum is about 90%, the water insoluble matter is small, only 0.3%, and the ordinary polyaluminum has more than 2%. The color is white and pure, and it does not contain any heavy metal except AL+. After the product water, the aqueous solution is clear and transparent, without any color, and the ordinary poly aluminum aqueous solution is yellow or brown in color. Low iron content, low temperature and easy to dissolve.