Electrodialysis (EDI) chemical water treatment equipment is a combination of an electrochemical process and a dialysis diffusion process. Driven by an external direct current electric field, it utilizes the selective permeability of ion exchange membranes (i.e., cations can pass through cation exchange membranes, and anions can pass through anion exchange membranes), causing cations and anions to move toward the cathode and anode, respectively. During the ion migration process, if the fixed charge of the membrane is opposite to the charge of the ion, the ion can pass through; if their charges are the same, the ion is repelled. This achieves the purposes of desalination, concentration, refining, or purification of solutions. Compared to reverse osmosis, another membrane separation technology introduced in recent years, electrodialysis ultrapure water equipment is cheaper but offers a higher desalination rate. Currently, the quality of domestically produced ion exchange membranes is also very stable, and operation and management are quite convenient.