I checked the tank the other day, and I was really impressed! All the rust is gone! Now I need to get the black stuff out. Normally this stuff can be easily scrubbed off whatever is being de-rusted, but I can't reach inside the tank. I've tried tumbling pea gravel around inside, but it doesn't work so well...
CAN ANYONE RECOMMEND AN ACID OR CHEMICAL THAT WILL DISSOLVE THE BLACK STUFF LEFT BEHIND BY THE ELECTROLYSIS PROCESS, WITHOUT EATING AWAY THE METAL TOO BADLY???
Thanks guys, I promise to post some pictures when I get this done with.
