My tank will eat copper, brass, aluminum, any bearing left in a block and its gone. Ive had this pallet of pellets since the mid 80-s.

Not sure what it is, just says "Caustic Soda" Change it every few years 4x8 by 3 feet deep, 3 heating elements set at 140 if I recall right, just shielded hot water heater elements. 2 inch thick blue foam attached to the outside ti insulate.

I can put a tractor or semi tractor block in for 5 days and it comes out steaming hot and looks crisp.

Im sure others have them as well.