Salt is chlorine. Salt systems manufacture chlorine in your pool water directly.

My opinion is this: The method of poolcare taught here is the safest, most efficient and effective you will find. Once you learn your pool's needs and how to meet them, this method takes only a few minutes a day plus occasional brushing / vacuuming (you'd need that any way). A salt system or any other system still requires daily monitoring - anything less and you'll spend a lot of time correcting big problems instead of a little time adjusting for measured needs of the pool.