The Drinkable Book – Cleaning unpotable water with silver particles

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“According to its developers, a simple book with twenty pages has the ability to provide enough clean water for a single person for up to a year. ‘The Drinkable Book’s filter paper will revolutionize water purification. It costs only pennies to produce, making it by far the cheapest option on the market. Each filter is capable of giving someone up to 30 days’ worth of clean water. And, each book is capable of providing someone with clean water for up to one year.” It’s also 3D printed so it can be made locally in small numbers.