The simple design is the true winner here. It consists of two ceramic parts stacked together. Inside the top piece is a black container where the salt water goes. The sun heats the container and turns the water to steam. Pressure starts to build and the steam is forced down a tube into a container in the other, lower part. Therein the steam will condense against the lid and the basin of the container will collect it.
The system can collect just over a gallon of fresh water per day and it costs US$50 to manufacture. Since it requires no electricity – only free, clean solar power – it is free to run. As many people in the developing world tend to carry water containers in their head, the bottom basin was designed to fit around a person’s head comfortably.
(Via Gizmag)