Sodium Salt of Polyaspartic Acid (PASP) is a green water treatment agent with properties of non-phosphor, non nitrogen, non-pollution and fulybiodegradation. Sodium Salt of Polyaspartic Acid has good scale inhibition on calcium carbonate,calcium sulfate, barium sufate, calcium phosphate,etc.Moreover, PASP has dispersion and corrosion inhibition properties to metal equipment.