I agree. The tiny little dryer on the 300 Enaly would provide dry air to the cell for about five minutes if you're lucky, become saturated, and then start to pass moisture. I mean really, you would have to recharge the tiny little dryer every time you wanted to ozonate water-take out the dessicant, put it in the oven, dry it, put it back in the tube, hook it up and begin to ozonate the water.
I think I'd throw away the dryer and take my chances that the benefit from the ozone would outweigh the tiny amount of NoX created in the water I was ozonating. I also wouln't use the machine in a highly moist area like the shower.