I got so excited seeing a Voltron video getting recommend to me again because I haven't seen anything Voltron related in years. I just assumed youtube was doing that thing again where it recommends random old videos to a bunch of people out of nowhere. Then the '1d ago' hit me like a bag of bricks.
Hunk is on to something. My guess is that they pee or poo the way cats do, have a human size litter box with living organisms inside of the litter product then after doing it, dump some more litter product on top of it then drain it out the airlock.