The unit of ozone in water can be expressed in different ways, common ones are milligrams per liter (mg/L), micrograms per liter (μg/L) or expressed as a volume ratio (for example, milliliters per cubic meter). Ozone levels are usually measured in these units.
The definition of ozone content depends on the application area in question. In the field of water treatment, for example in drinking water treatment processes, ozone levels are often set within a specific range to ensure the killing of bacteria and elimination of odors. Different applications require different ozone concentrations, which can generally range from 0.1 mg/L to over 1 mg/L.
In other contexts, such as in aquatic ecology studies, definitions of ozone concentrations may be relevant to the health of microorganisms and organisms in the water body. Therefore, defining ozone content requires taking into account specific environmental and application contexts.
