I went to the BBC story kindly submitted here to read it. At the BBC story that opens this thread, I see a linked BBC story &quot;Solving a Space Station&#x27;s Toilet-Shaped Problem&quot;[1] describing how difficult it has been to do water recycling on the International Space Station, where the extreme cost of transporting more water up into near earth orbit would provide a powerful incentive to develop technology to recycle water. Being in free fall in the limited space (and isolation from earth&#x27;s ecosystem) of the space station provides its own tough engineering challenges, but evidently even rocket scientists haven&#x27;t completely figured out how to do toilet-to-tap water recycling in all needed cases.<p>[1] <a href="http:&#x2F;&#x2F;www.bbc.com&#x2F;future&#x2F;story&#x2F;20150527-solving-a-space-stations-toilet-shaped-problem" rel="nofollow">http:&#x2F;&#x2F;www.bbc.com&#x2F;future&#x2F;story&#x2F;20150527-solving-a-space-sta...</a>