Ozone, sometimes referred to as energetic oxygen, is a powerful oxidizer, sanitizer and precipitant. It is made available for hot tubs and spas through the use of a device called an Ozonator.
Ozone is formed when three atoms of oxygen are bound together, instead of the normal two.
The corona discharge system, where air is passed through a high-voltage spark. This method requires expensive equipment, and is generally used in large commercial pools and bottled-water plants. For home spa use, an inexpensive, energy-efficient Ozonator is much more practical. The ozonator generates ozone as air is exposed to Very Ultra Violet light, and then injects it into the water. The ozone not only destroys microorganisms, it also breaks down harmful chemicals and causes total dissolved solids to clump together for easier removal by the filter.