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This post was last edited by hesonchang214 on 2019-11-6 07:12. 1. When the EDI membrane module operates for extended periods under high current levels with a flow rate below its rated value, the heat generated on the plate side cannot be dissipated effectively. As a result, the membranes and separators near the poles of the EDI unit become heated and deformed first; the pressure difference in the concentrated water stream increases, leading to a decline in water quality and quantity. In severe cases, carbonization and leakage may occur. 2. If the EDI membrane module is not cleaned and maintained for an extended period, scaling occurs on the membranes and channels of the EDI system, the pressure difference between the inlet and outlet water increases, which leads to a decline in the quality of the produced water. The current cannot be adjusted, and the voltage rises. 3. Improper control of oxidants such as residual chlorine in the ultrafiltration system results in an excess of oxidants reaching the EDI, which causes the EDI resin to break down and blocks the water output channels, leading to a decrease in water flow. 4. Improper cleaning and disinfection methods directly cause the EDI resin to break down, increasing the pressure difference between the inlet and outlet water, which results in a decline in both the quality and quantity of the produced water. When the EDI system is operated manually and powered on under a water-deficient condition, it causes the diaphragm and resin to heat up and carbonize; cleaning is ineffective and the system becomes unusable. 5. There is no safety filter before the water enters the EDI system, or the pipes and tanks were not thoroughly cleaned during installation; as a result, foreign objects block the EDI channels, increasing the pressure difference between the inlet and outlet waters, which leads to a significant reduction in the amount of water produced, and cleaning efforts prove ineffective. 6. The product was defective at the time of manufacture, and it started leaking for no apparent reason after being used for some time. 7. The current and voltage exceed the rated values, or there is human error in operation. 8. The system’s process design is inadequate, failing to meet the requirements for using EDI. 9. Improper system maintenance and management, with failure to comply with the usage conditions of EDI.