The oldest method for production of pure water is the thermal method or distillation. The process is the transfer of water that is in evaporated phase with its subsequent condensation leaks into a flask tube. The main drawback of this method is the very high maintenance costs of the electricity needed to convert the water into the steam. In addition, in the process of steam formation along with water molecules other solutes can enter the steam according to their volatility. Evaporation is achieved in various ways: the vacuum above the water, heating, etc.