Ozone is a very strong oxidizing gas; this three-atom form of oxygen is a naturally occurring compound in the earth's atmosphere It kills bacteria and viruses very effectively (disinfection), and is also able to remove smell and color.
It was recognized already a long time ago as an effective method for water cleaning.
Ozone cannot be stored or transported because its unstable tendency to break down quickly, so ozone must be generated on site.
Ozone is able to oxidize most organic and inorganic material. When the ozone encounters a substance in the water, one oxygen atom from the Ozone (O3) breaks away, attaches itself to the compound, and oxidizes it/breaks it down. Hereby the Ozone converts back to Oxygen (O2), so there are no problems with harmful rest products.
Ozone acts 3000 times faster than chlorine as a bactericide. Chlorine must first diffuse the cell wall after which the hypochlorous ion act on the cell internally. This process can take 30-60 minutes. Ozone on the other hand kills bacteria within a few seconds by a process known as a cell lysine. The Ozone ruptures the cell membrane and dispenses the cell's cytoplasm in the water.
The oxidizing effect of Ozone even increases when there is a little bit of chlorine in the water (usually even the small amount in drinking water is even sufficient). Instead of destroying the Chlorine as typical Ozone systems do, the triple-O system activates the available Chlorine elevating the Chlorine effectiveness. Sometimes it is useful to dose a little of extra Chlorine in the water.
The Ozone also acts as a micro flocculate aiding in the coagulation, settling and filtration of solids, thus improving the overall water quality.