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NASA is recycling 98 percent of astronaut pee and sweat on the ISS into drinkable water
(www.engadget.com)
This is a most excellent place for technology news and articles.
It doesn’t say how the 2% loss occurs. I’m curious how water actually leaves the system since the ISS is obviously airtight.
Probably is just some poo and piss byproducts that can’t be refined