A small amount of natural salt is dissolved into the pool water. The sanitizer’s electrolytic cell is plumbed directly in-line with the pool equipment, typically after the heater.The power control unit is wired to the pool timer so it sanitizes the water when the pump is running.As the water flows through the electrolytic cell, electrolysis separates the salt water into it’s basic components, sodium and chloride.Pure chlorine gas is produced by this process and goes to work in the cell chamber to oxidize bacteria and sanitize the pool water.Following this process the chloride and sodium re-bond and become natural salt again.