The device, which looks like a tiny rectangle of black glass, can cleanse water faster because it taps into the visible part of the solar spectrum that contains 50 percent of the sun's energy. When you leave bottles out in the sun, you're depending on UV rays that only contain four percent of the sun's energy to annihilate germs. In the team's tests, it managed to destroy most of the germs in 25mL of water with a bacterial concentration of 1,000,000 per mL within 20 minutes. That's under a light source that only had visible light without UV, which means the process could be even faster under actual sunlight.
It currently only works for a subset of bacteria, so it'll probably be a few years before there's anything practical.
Potential water purification technology
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