Ozone (O3) is made by splitting an Oxygen (O2) molecule, and re-combining the atoms as an odd number. This can be done in two ways.

1. Using a high voltage discharge, commonly referred to as Corona Discharge. Think of it as making lightning in a box.
2. Using Ultra Violet light at a particular frequency.

Wassertec manufacture both types of ozone generator. As a rule Corona Discharge is better suited to water treatment and Ultra Violet is better for Air treatment.