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%.

Players have a Stomach organ with a 10 L capacity. Water inside the stomach (obtained from drinking at a 1:1 rate) is metabolized into Polluted Water at a rate of 20 L/h while being equalized to a 37°C body temperature. This conversion/equalization is halted on a Sleeper/Cryo Tube and multiplied by offline metabolism multipliers for offline players.

Sanitation needs correspond to 20%/L of polluted water inside the stomach. This need can be reset by emptying the stomach's polluted water contents into a Toilet, at the cost of some clean water (which is converted into polluted water in the process).