I just aquired 7 power supplies (brand new) from large computers. 110 0r 220
AC in out put is 48 volts DC 330 watts.
I figure along with a current limiter (size based on how large my silver
electrodes are) I can make multible batches if necessary.
I got them at a good price (FREE), left over from some items my Son was
selling at a computer show.
At 1 to 3 Mill Amps per Gallon  you could run a 100 Gallons if needed.
Bob