I too have purchased Synergy Ozone Machine and of the half dozen or so machines i have or have had over the years the WPS 100 has been the best on price and quality. I use it for making Ozonated Olive-Oil and can turn a Liter of oil into OOO3 in around seven days using an O2 feed at 1/16 lpm with a 2 micron diffuser. Whilst John does not sell them to be used for medical purposes I would not hesitate to use it for certain "medical" procedures.