The use of chemistry in this game is one of its best aspects, but the management of the three vital elements, Carbon, Hydrogen, and Oxygen, can yet be improved.
The current oxygenator functions by electrolizing water to produce hydrogen and oxygen. The Oxygen is saved, the Hydrogen is presumably released. This means that as Oxygen is consumed, Hydrogen is taken out of the system. This is inherently water-negative. As a result I would reccomend a different mechanism for oxygen production.
Instead of consuming our limited water supply, we should take in CO2 from the surrounding atmosphere. Put it through a co2 filter, and you get breathable oxygen. It's dependent on co2 filters, but they degrade rather slowly.
Instead of consuming the limited water supply, it enables a far more stable regulation of gasses.
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