The DC models that do not have high ripple are the only models that I promote. I know they are expensive but if someone needs one, they usually keep it for cleanses but not everyday maintenance. Or, they buy the ionic foot bath and then sell it back when they are done with it. Some of the bad rap on these ionic foot baths are almost all from AC models. I was just reading a site on how they don't work. They do not mention what type of power supply it has nor the amperage of the unit. I don't blame them for writing this up as not all foot spas do the job.
For the many reasons I prefer DC ionic foot spas over AC powered models, I have chosen to only promote DC models. About 75% of the people call in asking me about some AC model they see on the internet. I will not trash talk the AC model foot spas. If you do enough research, and hear all the negative reviews on these from angry customers, it probably is not a low ripple, DC power ionic foot spa based on my research.
If you need my help picking out a DC ionic foot spa that is right for you, take my Ionic Foot Bath Quiz.