Skorzeny: You can put water in the tank, and any solution in a smaller container. Most laboratories use beakers labeled for each agent, even capping them for storage and quick re-use. Hate to tell you guys, but besides the ones I use in my dental lab, I've got one out in the shop that's 1' by 2' and 1-1/2' deep. Rifle recievers go in it nicely, with just a little barrel sticking out.
Really nasty machine though, if you don't turn it off before sticking your hand in the water, it feels like red hot chicken wire is passing through your flesh.