This ‘solar distiller utilizes a slowly rotating cylinder by a solar-powered DC motor and, upon testing a prototype, could achieve up to 400 percent more power efficiency than traditional devices.  

A novel desalination membrane:

Researchers from the University of Jordan, Arab Open University, and King Abdullah University of Science and Technology designed a method that enables evaporation and, therefore, desalination at ambient temperatures of [about] 25 degrees celsius (°C). Thus not requiring heating or high pressure as costly comparable devices do.