The dosing of ozone, a strong oxidative compound, provides an intense disinfection of the liquid. This requires the necessary precautions. There is also an ozone-generator needed which makes this process more complex compared to a UV-lamp or a H2O2-dosing.
On the other hand, ozone is very strong at disinfecting so it provides for a reliable method.
PCA can help you with this technology, both in design and construction of the installation.