Traditional antiscalant: It cannot be decomposed into non-toxic substances under the action of microorganisms and fungi, and long-term accumulation will cause potential hazards. Alternatives: Phosphate-free, biodegradable green corrosion and scale inhibitor polyaspartic acid. Polyaspartic acid: the best scale inhibition performance, and has very good biocompatibility and biodegradability, and has a certain corrosion inhibition effect.