Hi there, I am asking for a friend, though am interested in maybe getting an ozone generator for myself now that I've done a little reading on the topic - what machine do you and your wife have? I looked up your web page, but it seemed like there were several models suggested. I am assuming my friend would be looking for a medical grade generator, since she is treating metastasized breast cancer, but I know she is on a budget, so does not have unlimited funds. If you can advise on any particular model or provide a web site address, that would be much appreciated. Thank you!