I believe it is a pretty well established fact that at least one Southern Armory during the "War of Northern Aggression" had people save their Urine & bring it in, from which the procured the Saltpeter (Potassium Nitrate) they need for making powder.
I have also heard of the practice of mixing some Saltpeter in the quench water for CCHing for the purpose of releasing Oxygen to produce better colors.
I am not enough of a chemist to know for certain but perhaps peeing in the tank would produce a similar affect, but I'll leave it to others to find out.
