The special coatings optimize the production of chlorine over the production of oxygen thereby not requiring as high a salt level. If you just put plain platinum or carbon core electrodes in 3000 ppm salt water, you would generate a lot more oxygen. The special coatings may help lower the activation energy for chlorine generation even further and increase activation energy for oxygen.
The other purpose of the coatings is to increase electrode life. Nevertheless, there is some degradation of the electrodes, usually at their edges.
The other purpose of the coatings is to increase electrode life. Nevertheless, there is some degradation of the electrodes, usually at their edges.