When I first began my iontophoresis treatment for my hands I used just enough water to submerge my hands but my finger tips were always still sweaty because the water did not reach it. After two or three weeks I stopped sweating, but my finger tips did not and that did not bother me too much because it was a small surface area. I eventually stopped for 6 months just because it was too tedious and recently started doing the treatment again. This time I put twice the amount of water, with salt, so my hands would be fully emerged but it seems like it has not been as effective as the first time. Does the amount of water you put matter in the effectiveness? Also, this is a homemade iontophoresis device with two aluminum pans and I use two 12 volt and one 6 volt batteries for a total of 30 volts which I can tolerate. Does anyone think the voltage might be too high to negatively impact health?