1. Clean with oxidant;
2. Use surfactant or organic solvent cleaning agent for cleaning.
3. Use the mixed washing solution of sodium bifluoride and alkali, the mixed washing solution of sodium bifluoride and acid, or the mixed washing solution of sodium bifluoride and sodium fluoride for cleaning;
4. Alkaline washing method: The commonly used alkalis are sodium hydroxide, potassium hydroxide and sodium carbonate. The PH value of the prepared alkaline solution is also determined by the type of membrane material. In addition to the CA membrane requires a PH of about 8 and a corrosion-resistant PH of 12, the pump is also used for circulating operation or soaking for 0.5 to 1 hour, which is effective for removing organic impurities and grease;