Due to many chronic health issues for over 25 years, I am very interested in ozone therapy. It seems to be the general concensus that cold plasma and true cold corona (dual dielectric)are the two best technologies. If this is the case, why aren't there more manufacturers of these types of generators? I realize that Plasmafire makes a cold plasma machine but, quite frankly, I have read so many complaints about the company it makes me very uneasy to place an order with them. This search for the correct equipment is extremely frustrating and time consuming. Since the Germans seem to have the longest experience with ozone therapy, what brands of generators are they using? Somebody, somewhere has the answer. It's just absolutely ridiculous that it has to be this difficult to get to the truth. 9 year 0 answ.