There is a water quality electrolyzer that can make tap water or other water containing impurities turn into different colors and produce suspended matter. What is the principle?

First of all, this is a simple electrolytic reduction oxidation process. The electrons gained by the positive electrode are reduced, and the electrons lost by the negative electrode are oxidized. Second, the anions and cations in water are oxidized and reduced to simple substances, or further oxidized and reduced to high-valent ions, thus developing color. Thirdly, it is not excluded that the electrode is a non-inert electrode, which makes it participate in redox and increases impurities in water, resulting in discoloration and turbidity.

For example, if the electrode is copper and there is a trace of sodium chloride in the water, a small amount of chlorine will be produced under high current, which will react with water to become hydrogen chloride, and then corrode copper to produce copper chloride, which will be green, and then part of copper chloride will be reduced to copper, and then oxidized to black cuprous oxide particles, suspended in the water. . . .