It's called Solarvatten Petra is the brainchild of Swedish and Wadstrom (in pictures).
This is a device capable of purifying water using the’solar energy.
A simple system that would allow millions of people in poor countries have access to drinking water.
Continued from above:
Solarvatten is simply a tank that can hold up to ten liters of water.
Operation is very simple: you put water into the opening until the container is black, which then lets 3-4 hours in the sun.
Solarvatten is equipped with an indicator, turns green when the power was water purification.
Then you place the container in a cool place and you can finally tap water, hours drinking, using the open white.
The invention of the Swedish girl has already been tested in Nepal and Kenya, which has seen very positive results.
