Oxygen Not Included

This is what you do to get rid of carbon dioxide build-up in your base in the early game: Just pump it into a canister filler, hit empty storage for a few times when full, CO2 dealt with.

Also serves as a poor man's gas filter, if you need to quickly grab a bit of hydrogen from the top or a bit of chlorine from a caustic environment. The bottles can be moved around and emptied.