The salt crystal molecule is made up of chlorine and sodium. Salt that has been added to your pool water is passed through an electronic cell. The electronic cell breaks the bond that holds the molecule together. This process frees the chlorine to perform the sanitizing of your pool. After the chlorine does its work, it recombines with the sodium to form salt again. The electronic cell is controlled by a low voltage power supply. You will find the RainKlor low voltage power supply easy to install and easy to operate. One dial controls the chlorine level in your pool.