Samuel Dorevitch of the University of Illinois at Chicago in the U.S. will build solar-powered ozonation systems to supply purified water to families living in Kenyan slums. Many peri-urban informal settlements (slums) around the world lack safe, affordable drinking water. In the absence of centralized water purification, methods like chlorination, solar disinfection, and filtration can be used. However, these are time-consuming and expensive, and are generally not monitored for water quality.