Let me start by saying that Tom is a competent, knowledgable man when it comes to the ozone treatment! I have owned my 2000 Toyota Celica GTS for 10 years and inside it is all leather. I have smoked in this poor car for half f the time I have owned it, and the smell. . . well, it's pretty bad as you can imagine. After 45 minutes with the UV Ozone Generator inside the car, and 30 minutes with it in there with the a/c running and whaala! The smell - yes, it's gone. While talking with Tom, I learned that he can do this treatment inside houses up to 5,000 square feet!! Whooooaaaa awesome. Recommended - yes definitely!