In a state-of-the-art reverse osmosis filter system, salts are separated from tap water to make it drinkable. The membrane, which is more like cellophane, allows only water to pass through. The filtration process used by commercial systems is similar to that used by classic residential reverse osmosis water filter systems. Reverse osmosis technology purifies water and removes salts, minerals and other impurities. It also discards harmful bacteria, protein, and other particles that have a molecular mass. These reverse osmosis water filter systems clean the water of contaminants and remove non essential and corrosive salts, metals, chemicals that are found present in the water. Most membranes remove 90-99+ % of the dissolved impurities depending on the impurity and the composition of water. Light commercial reverse osmosis filtration systems are successfully used in many applications that demand large volumes of treated water, with high levels of purity. In the process of using a reverse osmosis filter, purified water permeates the membrane and is collected, while the concentrated water, containing dissolved and un-dissolved materials that do not flow through the membrane, are then discharged to the drain. A reverse osmosis filter system uses pressure to force water through a specially designed membrane. Also, commercial reverse osmosis filters system is an ideal mechanism for removing huge amounts of water contaminants on a large scale in places such as business establishments, manufacturing facilities, restaurants, and schools. The pretreatment process starts off with the clarification of water and water softening. It then goes into the post treatment stage and often involves ozonation and chlorination systems. These commercial reverse osmosis filter systems are widely used for purification of drinking water, a testament to their versatility and reliability.