Image copyright WATERISLIFE/Kristine Bender Image caption The next stage is to test the books in larger trials where they are used by local residents
A book with pages that can be torn out to filter drinking water has proved effective in its first field trials.
The "drinkable book" combines treated paper with printed information on how and why water should be filtered.
Its pages contain nanoparticles of silver or copper, which kill bacteria in the water as it passes through. ... Read more about Bug-killing book pages clean murky drinking water - BBC News