I put a set of barrels into the electrolysis tank with an anode in each tube, in addition to the anodes on the sides and bottom of the tank. They are a very pitted set of stub twist from a 1905 hammergun. There is a massive amount of hydrogen bubbles emitting from the muzzle and it's drawing about 20 amps. Due to the proximity of the surfaces to the anodes most of the electrolysis is occurring inside the tubes.