A book with pages that are impregnated with copper or silver can filter dirty water into drinkable water.
The pages of the Drinkable Book contain the instructions on how the book should be used as a filter.
The metal contained within the book's pages kill bacteria in the water as it passes through.
In successful trials at 25 contaminated water sources in South Africa, Ghana and Bangladesh, the paper removed more than 99% of bacteria.
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