I hope this helps.UNDERSTANDING HOW AN OZONE GENERATOR WORKS Just be sure to completely evacuate the ozone from the garden before any people or pets enter the area. If no noticeable plant damage occurs after 48 hours, you could slowly increase the concentration of ozone and/or the duration of the treatment time until you have achieved the results you desire. If you want to experiment with ozone as a pest insect treatment, you could increase the level of ozone for half an hour to an hour and then wait 24–48 hours to see if it is effective or if there are any adverse reactions. I can tell you that sensitive, leafy greens will probably be more adversely affected by ozone treatments than robust plants. I do not know how your specific plants will react to ozone treatments, so I do not feel comfortable giving you specific recommendations for treatment. Horticulturists who decide to implement high concentrations of ozone as a method of pest control need to do so with the utmost caution. High concentrations of ozone can also cause damage to plants, which is why high levels of ozone are usually reserved for treating or sterilizing an empty room. It is also very difficult to achieve this high of a concentration of ozone without a special ozone generator (an oxygen-fed ozone generator). In fact, ozone levels of 25 ppm and higher are considered immediately hazardous to human life. However, ozone at this high concentration can be extremely dangerous for people and pets. In an environment with a concentration of 2,000 ppm of ozone, pest insects will most likely perish in anywhere from a half hour to two and a half hours.
Again, there is not a great deal of information on the subject, but it appears that a concentration of 1,000–2,000 ppm or even higher (some people say as high as 10,000 ppm) is required to kill spider mites. For ozone to be an effective insect killer, the concentration of ozone in the air must be extremely high. Although there is not a lot of information on the subject, some indoor growers claim to have successfully used ozone to treat pest insects.
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