Solar Desalination Activity Source: NASA Grade Levels: 3-10 Background Desalination is the process of removing salt from water. The process of desalination can serve as a vital tool to bring fresh water to people and communities that may not have reliable access to safe drinking water. Solar stills have been used since ancient times to treat saltwater. In this activity, you will create a simple solar still, and can do calculations of the energy required for the process. [Read More]