In our studies we found that energy saving is possible to use solar energy to desalinate sea water and obtain fresh water to irrigate our fields. The system is simple: a series of trays degrading staircase, blackened to collect more solar heat-sealed in a box covered with glass tilted. From a small tube is inserted in the upper sea water that slowly fills all the seats. The sun heats the water and causes it to evaporate, the water vapor collects on the bottom surface of the glass and slides toward the lower part where a special collection tube allows the leakage in a vessel. It then introduces the other sea water and continues to delight.