Space can be an unfriendly place when you need to use the facilities. That's why the most expensive toilet ever made is out of this world -- literally. It's outfitted with leg restraints to keep the astronauts seated during bathroom breaks, so it's a serious piece of equipment. Clearly, going to the bathroom isn't a simple dump and flush operation in space. Liquid waste is recycled in a three-step process and reused. Solid waste isn't recycled. (We're breathing a sigh of relief here).
In 2007, NASA purchased the toilet from the Russians for use in the American section of the station. It was considered a bargain at the time. A similar toilet was already in use on the Russian side, and designing one from scratch would have cost NASA even more than the staggering $19,000,000 price tag.
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