Sunlight powers portable, inexpensive systems to produce drinking water
The U.S. Department of Energy will soon announce semifinalists for its Solar Desalination Prize. The goal: a system that produces 1,000 liters of usable water for $1.50… Such systems could surmount a big downside of reverse osmosis: it typically desalinates only half of the input saltwater, and the solution left behind eventually builds up enough salt to clog the membrane…