Operation of the direct flow reverse osmosis Before reaching the membrane, tap water passes through various cartridges. Their functions: provide a first level of filtration to protect the membrane in particular by trapping sediments, dechlorinating the water using activated carbon, or modifying the structure of the limestone by using KDF (mixture of copper and zinc). .. The membrane then removes 80 to 95% of the dissolved solids, the water thus filtered is of exceptional quality. Depending on the reverse osmosis model, the membrane has a more or less significant daily filtration capacity: from 50 to 285 liters per day for the 75 GPD (Gallon Per Day) membrane and from 125 to 475 liters per day for the 125 GPD; these figures largely depend on the pressure, the temperature and the quality of the water to be filtered. The minimum recommended pressure for good performance of our direct flow reverse osmosis system is 2.8 bars. Without a buffer tank, the flow rates will be respectively 9 to 11 liters per hour , direct reverse osmosis and 5 to 8 liters per hour. The osmosis water/rejected water ratio is 1 liter for 4 litres. The discharged water can be recovered and used for non-food uses.