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This post was last edited by hesonchang214 on 2020-4-9 09:01. EDI units are used in industrial pure water treatment systems; they combine traditional electrodialysis technology with ion exchange technology. Under the influence of an electric field, the selective permeability of cation and anion membranes to these ions, along with the ion-exchange capacity of ion exchange resins, enables the ions in water to migrate in a directed manner, thereby achieving thorough purification and desalination of the water. Conductivity refers to the fact that soluble salts in water are in ionic form and thus possess electrical conductivity. The more dissolved salts there are, the more ions there are, and thus the higher the conductivity. Based on the level of conductivity, the amount of soluble solids in water can be indirectly determined, and the conductivity allows for an initial assessment of water quality. From the above two paragraphs, we can see that addressing conductivity instability should focus on the following aspects. 1. The water quality analysis is not detailed enough. Due to insufficiently detailed water quality analysis and a lack of clarity regarding the ionic substances in the water, the technical requirements for the ultra-pure water production equipment do not meet the standards for the resulting water quality. 2. The electric field strength is insufficient. The electric field strength is insufficient, resulting in the movement of some ions not being directed in accordance with the water production standards. 3. Cation-anion membranes (also known as cation-anion exchange resins) are not cleaned on a regular basis. Over time, anion and cation membranes can develop fouling on their surface due to microorganisms, small particles, colloids, and other impurities. This fouling blocks the surface of the ion exchange membranes, preventing the anions and cations in water from migrating in the desired direction, which in turn leads to problems with conductivity.