It's a salt-based system. Nothing different than having a salt-water pool in your back yard. Chlorine is sodium-based, but chlorine can be irritating and even potentially harmful to sensitive swimmers, so salt-water systems are used as an alternative. Salt-water pools are basically chlorine-based pools, only without the additional chemicals but serve the same purpose: to kill bacteria and other harmful contaminants in the water. They are also cheaper and easier to maintain.

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