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Common Name(s): Ozone
Molecular Formula: O3
Used For: Maintaining ORP

Oxidation of organic compounds Control of water-borne pathogens

Caution: Don't inhale gas
Material Safety Data Sheet: Ozone


Ozone is a strong oxidising chemical, most common in a gaseous state, with a distinct "burning electrical" smell. Easily created by passing oxygen through an arcing electrical current which breaks apart molecular oxygen (O2) and allows the recombination of oxygen into O3. In nature ozone is produced by lightning in the same process, it is also produced in small quantities by white blood cells to control pathogens. Ozone forms oxides in metals (except noble metals) and reacts strongly with most organic molecules, particularly molecules that contain double bonds. Many plastics and rubber materials are susceptible to cracking when exposed to ozone, the cracking found in O-ring seals is often an example of ozone attack.


Primarily used to enhance water clarity through the oxidation of organic compounds, ozone has other beneficial uses in raising the ORP of water, controlling water-borne bacteria, protozoans, viruses and algae. Ozone can be applied in a specially made ozone reaction chamber or added to a protein skimmer.


Due to it's reactive qualities with metals, ozone precipitates manganese from the water and forms toxic chemicals from bromine, sulphuric acid from hydrogen sulfide and is toxic in its own state given sufficient concentrations to all marine organisms. The use of activated carbon on both exiting water and air is strongly advised as a means of reducing concentrations after treatment.