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Negatives of Ozone

Like every oxidant, ozone has its down sides. However, it is important we clarify the “actual” negatives vs. the “perceived” negatives.

Commonly Stated Negatives
  • Material Degradation
  • Can harm people, pets, plants
  • Oxidizes materials

In light of ozone’s effectiveness, are the three items really negatives, or do we just need to use it safely like electricity or gasoline? All oxidizers will have similar “negative” effect if used imcorrectly so proper implementation is critical to achieving outstanding results in your process.
The real negatives are listed below

Dissolved in Water (pH 7)
Temperature Time
(°F) °C
59 15 30min
68 20 20min
77 25 15min
86 30 12min
95 35 8min

Half Life: Ozone is an unstable molecule that quickly converts back to oxygen. The time needed for half of the ozone in air to decompose (half life) is 20-60 minutes depending on the temperature and humidity of the ambient air. The half life in clean water is about the same. Note: the temperature, pH, and water quality will affect half-life.

Storage: Due to its natural instability, medical ozone should be made on site to be effective. This requires feed gas preparation and ozone generation equipment. It would be ideal if ozone could be contained in a bottle and delivered onsite. We just aren’t there yet.

When can a negative be a positive? Since ozone cannot be stored, it is not possible to have a large, potentially dangerous volume of oxidizer such as chlorine or hypochlorite.

Inhalation: Ozone in certain concentrations can be hazardous to the lungs if it is inhaled in a large enough quantity.  As a reference, you will be coughing long before it is damaging.


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