Reverse osmosis water treatment chemicals are specially designed chemical agents for reverse osmosis (RO) membrane systems. They inhibit scaling of sparingly soluble salts such as calcium carbonate and calcium sulfate through antiscalants, eliminate microbial contamination using biocides, remove deposits on the membrane surface with cleaning agents, and neutralize residual chlorine with reducing agents to protect the membrane from oxidative damage, thereby extending membrane life and improving water production efficiency. These chemicals are widely used in ultrapure water preparation, seawater desalination, and high-standard water purification, ensuring the stable operation of membrane systems under high pressure and high-salinity conditions.