I was sceptical as it was £28 off ebay however, what a machine! Definitely makes a difference and at that price, even if it only lasts a year or two its not bad value. The only maintenance is every couple weeks or so it needs the vent hoovered.

How is Ozone Harmful?
The same chemical properties that allow high concentrations of ozone to react with organic material outside the body give it the ability to react with similar organic material that makes up the body, and potentially cause harmful health consequences. When inhaled, ozone can damage the lungs. Relatively low amounts can cause chest pain, coughing, shortness of breath and throat irritation. Ozone may also worsen chronic respiratory diseases such as asthma and compromise the ability of the body to fight respiratory infections. People vary widely in their susceptibility to ozone. Healthy people, as well as those with respiratory difficulty, can experience breathing problems when exposed to ozone. Exercise during exposure to ozone causes a greater amount of ozone to be inhaled, and increases the risk of harmful respiratory effects. Recovery from the harmful effects can occur following short-term exposure to low levels of ozone, but health effects may become more damaging and recovery less certain at higher levels or from longer exposures (US EPA, 1996a, 1996b).
Even in low doses, I still wouldn't want to breath it in.Black Grouse wrote: ↑Thu May 24, 2018 7:09 pmSeen that aspie however thats high concentrations. If you have a decent air flow in the grow room it should be fine I would imagine. You also get ozone generators that install straight into the grow room ducting.