Airlock An airlock is where you have two or more doors between the innermost part of your base and the outside. It assures that if someone chases you to your base or door camps you, they won't immediately have access to your loot. The bigger your base, the more airlocks you'll want...
This bucket needs to be partially filled with water or sanitizer to maintain an airlock. This system is passive so the only thing you need to do is leave it on for the active phase of the fermentation process. Of course, this is assuming you used a relatively large container for the foam...