Chuck Gould wrote:
Another useful concept to bear in mind when disposing of human waste is
that two types of bacteria eat this stuff in the holding tank.

Aerobic bacteria needs oxygen to survive. Aerobic bacteria generally
don't stink.
Anerobic bacteria emerge wihen there is no oxygen available in the
holding tank, and they tend to stink pretty badly.

Assuring the presence of some oxygen in the holding tank will help
control smells.

I have a vent for my holding tank, but I know that is not enough oxygen,
because it does stink. What system allows enough oxygen to promote
aerobic bacteria?