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NASA scientists believe a high concentration of calcium in astronauts’ urine is clogging the £150 million water recycling system on the International Space Station.
Engineers are investigating a problem with the system, which processes urine into clean water for drinking.
The Daily Telegraph reports scientists do not yet know if the high calcium concentration is due to bone loss, a consequence of living in a zero-gravity environment, or other factors.
"We've learned a lot more about urine than we ever needed or wanted to know - some of us anyway," said David Korth, the station flight director.
The 16-nation space station project has been under construction 220 miles above the Earth for more than a decade.
