Hot tub ozonators purify the water in your spa. The ozone generated by these units reacts with contaminants that are continually being introduced to the water. Ozone is one of the most effective killers of bacteria and viruses both in the air and in water. With proper filtration, all of the undesirable elements in you spa water will be filtered out and you will also be able to say adios to scum lines and foaming. Another advantage of using hot tub ozonators to purify the water is that you will use a lot less defoamer, sanitizer and water clarifier chemicals. This can only be good for your skin and eyes and will also reduce the odor that these chemicals tend to emit.