Lisa, from what I've been reading about ozone generators, unless it is a "true" cold corona unit, pumping air will create acids. Instead of pumping air, one would pump oxygen in the 90%-95% range, which can be done using either tanks (compressed air, difficult to deal with) or an oxygen concentrator. If you look at oxygen concentrators online you'll see what I mean. I've been looking at them on craigslist, they appear to run about $200 for a used one. It would be nice if James could confirm that you need an oxygen source for your ozone generator.