There is a lot of theory out there regarding the resonant frequency of water. I don't have the test equipment availible to test that theory, but it does make sense. Everything has a resonant freq. Finding that freq is troublesome and is not an exact science relative to all of the different water sources there are. Pure water (distilled, de-mineralized) would give you a base at which to start, but contaminants would change it. Making a 'floating' cell would allow the freq to be found naturally. Like a coupler to a transmitter. With a DC source, which in theory doesn't create freqs, it is a little harder. But even DC creates noise. In the cell I described, the floating plates would move back and forth from magnetism, which would create an artificial freq because the voltage between cells would constantly change, even though total voltage seen by the whole unit would remain contant. Hopefully the magnetism wouldn't get so strong as to lock the plate in one position. That's why it's theory.
I hope that gave a picture of the idea of a DC freq, if not I can elaborate a little more.
