The problem with any of these "chemical free" systems, is that people automatically assume that you don't have to add any chemicals. These systems only replace your sanitizer, they do not balance your PH, Alkalinity, Calcium Hardness, or Oxidizer levels. You are still testing pool water at least one time per week, and adding chemicals accordingly. In the same respect, you are still using a oxidizer with an ion system. Typically you activate your ion system with calcium Hypochlorite, and then maintain weekly with a potassium monopersulfate. I am a pool professional and in all honesty, I feel that unless you have reactions to chlorine, it is best to stick with that. It is by far the easiest. If you are trying to go "green" carefully research your products, as many of them still require some type of chlorine for activation, or use a peroxide based oxidizer. Hope this helps!