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What is Ozone?

Ozone is a naturally occurring oxidizing and disinfecting agent which is composed of three oxygen atoms combine to form O3. It is a bluish or colorless gas with a very characteristic odour. Ozone is highly reactive and its’ unstable nature causes it to rapidly decompose to oxygen, leaving no residues.

Ozone is present in the atmosphere in small concentrations, which are increased considerably in urban areas or after storms. The energy released from lightning produces ozone naturally, resulting in the fresh smell after a thunder storm. Ozone can also be generated mechanically by exposure of oxygen to a high energy electrical discharge (corona discharge), which is the process on which biofresh’s ozone product is based.

Property Ozone Vs Oxygen
Molecular Formula: O3 O2
Molecular Mass: 48 32
Color: light blue Colourless
Smell: clothes after being outside on clothesline
photocopy machines
smell after lightning storms
Solubility in Water (@ O-deg C): 0.64 odorless
Density (g/l) at 0C: 2.144 1.429
Electrochemical Potential, V: 2.07 1.23

For more than a century, ozone has been used throughout Europe and the United States for purifying drinking water supplies, bottled water, decontaminating cooling towers, and in a variety of applications for food processing plants.

Due to the natural molecular instability of ozone, the third oxygen atom breaks away to leave pure oxygen (O2) and a single, negatively charged, oxygen molecule. This single oxygen atom is a powerful oxidising agent that reacts with bacteria, fungi, spores and associated molecules that cause bad odours.


Ozone is well established as a safe alternative for disinfecting water, aerial environments, and solid surfaces. Unlike many other disinfectants ozone is produced on site, so it avoids the safety and insurance risks related to transportation and storage of chemical treatments.

Ozone Generation

Ozone gas is formed when oxygen molecules (O2) are exposed to either ultraviolet radiation or an electrical discharge, becoming oxygen radicals (O) that will bond with oxygen molecules (O2) to create ozone (O3).


Mechanism of Ozone:

Ozone will oxidize any susceptible substance such as bacteria, fungi, viruses, and any organic matter within its’ reach. During oxidation, the weak bond will split leaving oxygen as a by-product of the reaction.



Biofresh systems work with trace levels of ozone, which fall well within European Health & Safety guidelines. Contact Biofresh for further details.


Ozone Concentration

As shown in the diagram above, ozone occurs in nature at levels of up to 350 ppb (parts per billion). biofresh ozone systems work typically at levels of less than 200ppm and are well within health and safety limits.


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