a kind of high efficiency liquid antiscalant, mainly used for controlling the sediment of scaling in the membrane separation systems, the following types of scaling can be effectively controlled: calcium carbonate, calcium sulfate, barium sulfate, strontium sulfate, ferric hydroxide, aluminum hydroxide and silica etc. It has high efficiency scale inhibition, and cant react with residual coagulant, redundant aluminum and iron to form insoluble polymers. It applied in the RO membrane system, nanofiltration system and ultrafiltration system, extending system cleaning cycle and membrane life to lower operating and equipment cost.