Reverse osmosis membrane products correspond to a pH range, generally 2 to 11, and pH has little effect on membrane performance itself, which is one of the distinctive features different from other membrane products, but the characteristics of many ions in water are greatly affected by pH. For example, when weak acids such as citric acid are in a non-ionic state at low pH, they dissociate and become ionic at high pH. Due to the same ion, the degree of charge is high, the removal rate of the membrane is high, the degree of charge is low or no charge, the removal rate of the membrane is low, so the pH has a great influence on the removal rate of some impurities.
