Dog slobber. We have two dogs. One loves to take a big mouthful of water and run up to my wife and me with it, splashing drool water everywhere on the way. The other has recently learned this trick from him and now we have double dog drool. We don’t go barefoot much anymore.
Sorry, late night me brain forgot to provide the context for my comment! My concern would be occupational usage if it does produce any ozone, especially in the small business sector, which often doesn’t use as much caution around chemical exposure as one might want.
It might also be a non-issue. I have half a mind to build one of these and do some testing.