This hydrogel tablet can purify a liter of river water in an hour

https://news.utexas.edu/2021/10/05/this-hydrogel-tablet-can-purify-a-liter-of-river-water-in-an-hour/

"The special hydrogels generate hydrogen peroxide to neutralize bacteria at an efficiency rate of more than 99.999%... requires zero energy input and doesn’t create harmful byproducts. The hydrogels can easily be removed, and they don’t leave any residue... Materials for making them are inexpensive, and the synthesis processes are simple and remain that way at large scales. And they can easily control the shape and size of the hydrogels"

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https://www.eurekalert.org/news-releases/1076800

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