Thanks for the info - I've been looking for this kind of write up all day!! I have been considering many of these Ozone generators but was concerned about the amount of oxygen it would be pumping back into my room and what it might be doing to the Co2 levels. Your info has put me off getting one as I don't have anywhere to pump the air to other than outside. Do you know of anything else other than the carbon filters to reduce grow room odor problems without potentially damaging your crop?