A Human Centred Solution - Just add sun. Swedish inventor Petra Wadström created the Solvatten system to bring easy to use water treatment and solar water heating to people in developing countries. The device harnesses the power of the sun to treat and heat water, reducing the need to heat and boil water by burning firewood or charcoal. The units are capable of rendering highly contaminated water drinkable in a few hours, provided there is sufficient sunlight. Solvatten directly addresses poverty-related health issues that are connected to energy scarcity and poor water quality.