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Re:The Rise of Dismal Science Fiction by XorNot on Saturday March 24, 2018 @04:00AM (#16665442)
On some level they're probably just efficient sewage processing.
Re:The Rise of Dismal Science Fiction by jdietrich on Saturday March 24, 2018 @07:07AM (#16665997)
Astronauts on the ISS mostly drink recycled water, including bodily fluids:

https://en.wikipedia.org/wiki/ISS_ECLSS