GreenTech uses a three-pronged approach to purify your air through:

- Filtration, either taking place with a HEPA filter i.e., fysically removing viruses and bacteria besides bigger particles as well, or with a regular filter just removing dust/pollen and using ozone to klill viruses/bacteria.

- Ionisation; the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons. The resulting electrically charged atom or molecule is called an ion.They bond together resulting in the formation of ion pairs, getting heavy and stop floating in the air.

- Ozonisation with the addition of Odogard dispels odours. Drinking water is in most cases disinfected with ozone by your water supplier, as an alternative to chlorine. The same technique is used by GreenTech to purify the air, staying well under the legally allowed ozone levels. It is nature's way to purify air, which is what you smell after a rain storm, during a walk in the forest or at the seaside.