Regarding the use of ozone in water, it is completely safe and its use is regulated by its corresponding standard, being its habitual application in the purification of water.
In the case of water treatments for uses other than human consumption, the doses vary according to the characteristics of the water to be treated and the purpose for which that water is destined.
Since ozone is completely harmless when dissolved in water, there is no dose limit other than that established by the necessary efficacy in each case (recovery of wastewater for irrigation, recreational or ornamental uses, removal of chemical compounds in wastewater). textile industry, fiber bleaching, food washing, etc.)
Applied in air, despite being classified as «Irritant» by inhalation, the use of ozone in environmental decontamination is safe, contrary to what may seem in principle, due to the perfect control over the residual levels of ozone in the breathing air , which allows the use of a highly effective disinfectant without undesirable effects on people who occupy the common areas of the treated places, greatly avoiding the risk of contagion and improving air quality, not only in terms of microbiological levels, but also in terms of unpleasant odors and charged environments, providing healthy, clean and fresh air.
In the case of treatments carried out in the absence of people, the doses can be as high as necessary in each application. Given the short half-life of ozone, the safety time before access to the treated area will not be very long (20 to 60 minutes), and excess ozone can also be easily destroyed by UV, activated carbon filters, etc., in necessary case