Israel’s SunDwater harnesses the sun’s energy to heat and distill polluted or salty water and turn it into safe, clean drinking water. Solar mirrors heat the water and turn it into steam, which is then re-circulated back into a holding tank as pure distilled water.
http://www.greenprophet.com/2013/03/sundwater-solar-water-israel-distill/
http://www.youtube.com/watch?v=UaaI1jXhh_k&feature=player_embedded