Sanitation

Separate from Hygiene, Sanitation is a game mechanic which while currently having no impact is likely to introduce a medium-to-long-term need for a livable atmosphere on higher difficulties, while introducing an opportunity to substantially reduce water consumption rate by recovering consumed water.

It's completely absent on Easy difficulty, and proxies off both Hunger mechanic for buildup rate as well as its own Sanitation rate multiplier. This makes it indirectly dependent on Mood, with mood levels below 25% increasing sanitation demands by 10%.

Sanitation needs increase by 50%/hour, multiplied by hunger rate (after mood and offline metabolism multipliers) and sanitation rate. This need can be reset in a Toilet by consuming some water (which is converted into Polluted Water), with recovered water being multiplied by the sanitation rate multiplier.

On normal difficulty settings (100% hunger / sanitation rates) and assuming no mood penalties, the sanitation bar takes 2 hours to fill (6 in-game days), recovering 2.1 L of polluted water in the process (1.05L/hour, 0.35 L/day).

On Stationeer difficulty settings (150% hunger / 125% sanitation rates) and low mood penalties, the sanitation bar takes 58.14 minutes to fill (2.907 in-game days), recovering 1.68 L of polluted water (1.733 L/hour, 0.5779 L/day).