“Black rectangle” uses the sun to make water safe to drink

by Larra Morris

If you’re trying to kill bacteria in tainted water, one of the best ways is simply to leave that water in a clear bottle in direct sunlight, letting the ultraviolet rays do the work. That said, this method can take six to 48 hours to be fully effective. Instead, scientists at the US Department of Energy’s SLAC National Accelerator Laboratory and Stanford University have developed a quicker alternative. It’s a sun-activated device that kills 99.999 percent of bacteria in just 20 minutes.
via New Atlas

Image: Jin Xie/Stanford University

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“Black rectangle” uses the sun to make water safe to drink

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