We, ION WATER MACHINERIES, one of the pioneers in water treatment since 1967, situated at 10, Kiran Sankar Roy Road, Kolkata-700001. manufacturing various water treatment equipment. Reverse Osmosis is separation process , in which a solvent water in this case , permitted to pass through a semi permeable membrane, leaving behind the dissolved solids(constituted by various dissolved ions called Cations and Anions. Depending on the mobility of these, the water portion passes through the membrane and very low amount of salt will pass through the membrane. Thus the filtered water has about 10% TDS. This process will remove bacteria, Virus, Protozoa and reduce the harmful chemicals namely Fluorides, Nitrates, Pesticides, Lead, Mercury, Arsenic etc. During Reverse Osmosis Process, there is a continuous rejection of water with concentrated salt content and this will be coming out from the RO cartridge. This is very important for membrane cleaning and it also prevents membrane from choking due to scaling of Calcium and magnesium. Hence the water flow is adjusted in such a way that purified and rejected water is maintained at 1:3 ratio.