A Swedish inventor has unveiled a device that she hopes will be used to purify water for drinking in some of the world's poorest countries.
Petra Wadström has spent the last eleven years developing Solvatten, a solar-powered water purifier.
The device, which from the outside resembles a standard jerrycan, can be filled with up to 10 litres of water, opened out and left in the sun.
A simple indicator uses a red or green face to show users when the water is safe to drink.
Ms Wadström said: "My inspiration to work with Solvatten is the fact that people are living with dirty water around the world and children are suffering from bad water, which is easily preventable, but people are living with a lot of solar energy and not using it."
The Solvatten company has already tested its device in parts of Kenya, where Ms Wadstrom said that people using it gave a lot of positive feedback.
"It's very easy to understand the method, ...