Briny water that has more salinity than fresh water, but not as much as seawater, is often referred to as brackish water. Brackish water contains between 0.5 and 30 grams of salt per liter. It is known that the most significant amount of brackish water is found wherever a river meets the sea. While brackish water is salty, it’s not as salty as the water you’d find in the middle of the ocean. Reverse osmosis systems are used to desalinate brackish water. Desalination is the removal of salt from seawater. This is a technical term that is also known as sea water reverse osmosis. It provides essential water for drinking in desert regions or wherever the local water supply is brackish. Desalination is necessary because boilers and many injected surfactants cannot tolerate dissolved salts. The process of desalination in brackish water can be briefly defined in these 7 steps: pre filtration, pressurization of raw water, separation of raw water, recovery of the pressure in the brine, disposal of the spent brine, post-treatment, and finally distribution of the product water. Reverse osmosis has increased the raw water supply by making possible the use of brackish waters for potable water supply. Two distinct branches of reverse osmosis are categorized as seawater reverse osmosis and brackish water reverse osmosis. Reverse osmosis uses high pressure to force pure water out of saltwater. Using sea water reverse osmosis systems (desalination) is essential in supplying fresh water in cases where available fresh water resources are insufficient and utilization of sea water is inevitable (municipalities, industrial facilities, bottling facilities, etc.). The use of proper reverse osmosis water treatment systems like desalination is what allows plants to significantly improve raw water quality, diminish chemical waste and environmental impact, decrease the carbon footprint, and cut the cost of treated water for consumers. This advance in water quality leads to the generalization of essential pretreatment processes with the elimination of many or all processes.