It is not penetrating. However, most microbial or bacterial contamination is on the surface. This is performed by forcing ozone to react via a free radical pathway. Many molecules that are resistant to ozone alone are degraded by this free radical process. This is not to say that AOP is required for oxidation of organics, but in some instances it may be preferred.
Ozone is a form of oxygen.
It is a strong cleaning, purification and oxidizing agent. It reacts with organics to oxidize unpleasant odors and kills bacteria, viruses, mold and fungus. Ozone is O3 or enriched oxygen containing 3 atoms instead of 2. The third oxygen atom is loosely attached and easily separates from the ozone molecule to combine with other substances, thereby oxidizing the bacteria or microbe. Ozone can be used to purify air or water.