Following its natural cycle water in nature or the hydrological cycle as it is called scientifically, after its return to the earth's surface through precipitation, penetrates into the soil and then concentrated in underground aquifers.
The aquifers typically connected underground with the sea and cast out part of the amount of water in it. With the continuous increase ofpopulation in recent decades and the continuous pumping of underground water reserves at a rate that exceeds their renewal, caused reverse flow in aquifers videlicet saltwater intrusion. This caused salinization of underground water.
By salinization the dissolved salt (NaCl sodium chloride) incresed in the underground water and therefore the deterioration of the quality of water abstracted. Moreover subsoil eroded by seawater reacting with chemicals dissolved in the brackish water, such as mercury.
To deal with the salinity and its derivatives in areas where the water is pumped from wells the only solution to quality clean water is a reverse osmosis system. The reverse osmosis systems, apart from the protection offered us against microorganisms and chemical substances have a desalination membrane converting brackish water to drinking water.