>>530284794
It's a surprisingly simple system.
>liquid management:
Completely isolate fluid sources then pipe that shit around wherever needed.
>Gas management
If inside your base then burn power removing anything that isn't oxygen or CO2; if outside then
And again, isolate gas types. If you have things that release gas then you set up an area for that gas only.

As for using gas pumps in mixed gas settings, you abuse the way gas settles in layers on it's own. You can do this with either the top or bottom.