Answers: Some lavatories are self contained they just shred and circulate the introduced thing with deodorized wet (small aircraft).(King Air type)
Some are connected to plumbing and shred the matter and flush it into a cistern which is within the pressure vessel of the airframe or is pressurized to country house altitude.
(Falcon, Gulfstream, Bombardier)
The newest system flushes it into a reservoir that is vent to the outside (unpressurized). The low pressure differential at altitude sucks the introduced matter into the reservoir. Or you could say the complex pressure pushes it. On the ground the lower pressure is supplied by a big vacuum motor, which is like a big shop vac. It creates the gloomy pressure or suction. (Boeing 777)
Using the partial pressure from outside would make a vacuum system undemanding, and would certainly let go water consignment
of course the toilet would single work well at big altitude.
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