The diagram illustrates various stages involve in removal of salt from sea water to make it purified.
From overall perspective, the process consists of 6 stages, starting with transporting salty water to pre-treatment and ending with storing drinkable water.
As can be seen, firstly, seawater goes through a pre-treatment and undergoes a filtering process. After that, the filtered water passes the membrane by high pressure. Meanwhile, impurities and salt , bigger than the gate membranes are removed and membrane only let H2O molecules to go through. In the subsequent stage, liquid flows to the post-treatment. Furthermore, salt water is divided into two steps. The waste water is given back to the sea. On the other hand, in the post-treatment stage, lime, chlorine and fluoride are added water. Finally, the clean water is placed into storage to prepare for an integrated water supply.