This Ozone activates usually during a pre-programmed filter cycle some Hot Tubs have a 24hr circulation and Ozone mode. We recommend that your Ozone should run for between 6 and 8 hours a day. The unit does not blow air air is drawn through the Ozone on a venturi system. Usually you will find a designated water jet plumbed into the shell of the Hot Tub somewhere near the centre or sometimes a drain. Water will pass through the jet sucking in air through the Ozone injector which will be connected to the Ozone. During a filter cycle the Ozone unit will be powered up the Corona Discharge mechanism will kick in and charge the oxygen with Ozone which enters the tub and in turn helps to kill bacteria with the aid of the sanitizer in the water.