Reverse Osmosis is a seperatio in process Reverse Osmosis is a seperation process , in which a solvent, water in this case, is permitted to pass through a semi permeable membrane, leaving behind the dissolved solid ( constituted by various dissolved ions called Cations and Anions. Depending on the mobility of these ions, the water portion passes through the membrane and very low amount of salts will pass through the membrane. Thus the filtered water has about 10% TDS (Total Dissolved Solids). 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.