Half Life of Ozone 2018-01-21T21:26:34+00:00

Half Life of Ozone

A physician will want to know if the ozone they are using is at the correct “gamma”  or ozone concentration. Time will diminish the strength of the ozone, for example, in water it is as little as 20 minutes.

Usually ozone has to be made on site or used within the day depending on a number of factors. The half life of ozone is the time it takes for the concentration of ozone or “gamma” to become one half of its original strength.

If I make a 50 gamma ozone and the half life is 20 minutes then in 20 minutes it will only have 25 gamma.

What Physicians Need to Know


1) At room temperature, ozonated saline or distilled water should be used within 20 minutes, after which time it should be refreshed. Cold ozonated water lasts longer but is only useful for drinking. Double distilled water is an exception and can have a half life of more than 6 hours.


2) You can fill an insufflation bag or syringe and the ozone will last all day but will lose potency. (Caution – make sure that the products are ozone resistant.)

The half life for ozonated distilled water at room temperature is about 20 minutes. Double distilled water is about 6 hrs
(see chart below)

The half life for ozone gas in a glass container at room temperature is 3 days, however, humidity of 50% will cut that down to 11 hours.

Half life is dependent on:

  • whether the ozone is gas or in liquid
  • the temperature
  • for gas – humidity, air movement, reactivity of the container of the ozone
  • for liquid – whether it is distilled water, double distilled, or saline

Half Life of Ozone in Water


Figure 2: Ozone decomposition in different types of water at 68 °F. 1 = double-distilled water; 2 = distilled water; 3 = tap water; 4 = groundwater of low hardness; 5 = filtered water from Lake Zurich (Switzerland); 6 = filtered water from the Bodensee (Switzerland)

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The cooler the liquid temperature the longer the half life

Temp (F)Half-Life
Temp (F)Half-Life
5930 minutes
6820 minutes
7715 minutes
8612 minutes
958 minutes

For Saline

According to Russian medical experts the 1/2 life is about 30 minutes at 68 °F

For ozone in gas form tightly contained in a glass container

Temp (F)Humidity (%)Half life (min)in hrs
Temp (F)Humidity (%)Half life (min)in hrs


Temp (F)half-life *
Temp (F)half-life *

Decomposition of Ozone

from the site OzoneLab.com