Making salt water potable, removal of pollutants

Water is the most basic and fundamental components of life. Yet, only 1% of the Earth's water is fresh water. This small amount is becoming more inadequate, particularly in certain geographic areas of the world and in high-density population areas due to pollution and shortages of rainfall . Desalinating seawater has long been considered as a solution to the world's current and future water problem. But desalination has been costly and un-affordable in places where it is most needed. 

Desalination plants around the world today produce more than several billion gallons of water per day. However, the demand for water continues to exceed the available supply.

Scientists continue to research an methods of desalination and their efficiency.
 Project description:
In this project you will perform experiments to make fresh water from salt water. You may construct your desalination system from material that can be found at home or obtained locally. You may also perform some calculations to estimate the final cost of desalinated water with your system. 
 Details of this project:
More details or support for this project is available at the members section of web site. Material needed for experiment may be found at home or obtained locally.