Ozone technology has been in use for over 120 years

In fact, the first patent for an ozone generator was by Nikola Tesla in 1896, specifically US Patent 568,177 - Apparatus For Producing Ozone.

Tesla’s patent was originally created for air purification, however over time it was discovered to be an extremely effective and powerful water disinfectant. Over the last century ozone water treatment has become better understood and perfected. Today ozone is the fastest growing disinfection technology in the global water treatment market. Ozone is an environmentally friendly, superior water disinfectant that is energy efficient and chemical free.