I have two things that are bugging me. The first is the Hydrogen Generator, which will have a stored amount of hydrogen and still not generate power. This is probably known, but it's really bugging me.
The second is the Distillers. I don't know if it's a bug, or I'm not looking at the right time, or what, but I swear that no matter how much slime goes in and bad water comes out, no algae comes from the machine, or it's such a tiny amount that I can't see it.
I'm new to the game, but if these two things were fixed, I could do so much more exploring without worrying everyone was about to fall over dead.
Running a hydrogen generator above an electrolyzer, with a filter pump to put hydrogen in the generator and oxygen in another room. As for the distiller... literally every time I've used it.