Okay, J. For the sake of argument, I will concede that it doesn't need heating, and can be simply tossed into a room chock full of people from ports in the ceiling, and that this will be lethal for its occupants. Okay, what now? You have a room full of dead folks, and piles of Zyklon B pebbles on the floor emitting toxic gas (somehow). You need to kill your next batch of Jews. What do you do in order to prepare that room for the next batch?
And keep in mind, we're supposedly talking about the very efficient, and technologically advanced, 1940s Germans.
The logistics and required energy of the transport, killing (by gas anyway) and cremation and disposition of the six million, not ta mention the other six million non-jews, makes the claimed numbers impossible.
