1. PH range is wide, agglomerate speed is fast, agglomerate density is big and firm, settleability is good, it is also effective to remove turbidity and bacteria and algae, it is not affected by oxygen treatment, do not increase the soluble metal (aluminum, iron) in the treatment water; 2, improve the solid wave separation speed, in direct filtration, can extend the working cycle of the filter, can be mixed with water in any ratio.