Water purification system using reverse osmosis technology purifies water with action of pressure difference of semipermeable membrane. Counter pressure larger than osmotic pressure is adopted to separate, extract and purify the water, removing 97% soluble salt, 99% colloids, microbes, particulates and organic substances. Raw water is passed through multiple filtration process in order to purify its physical, chemical and biological impurities and at the same time ensure its mineral contents are conducive for human consumption. Various filtration processes commonly used are described below: Pressure Sand Filter Vessel Used to remove suspended solids and undissolved impurities from water. The filtration medium consists of multiple layers of sand with a variety in size and specific gravity. The filters effectively remove up to 30-50 micron of the suspended solid to less than 5 ppm. Activated Carbon Filter Vessel The filter is designed with multiple layers to reduce or eliminate bad taste, odors, chlorine and many organic contaminants in water. Activated carbon has a slight electro positive charge added to it, making it attractive to chemicals and impurities. As the water passes over the positively charged carbon surface, the negative ions of the contaminants are drawn to the surface of the carbon granules. Micron Filter It removes the fine particles such as dirt, sand etc. up to 5 microns and reduce silt density index to acceptable level. High Pressure Pump Suitable to feed raw water through the reverse osmosis membrane with high pressure. Reverse Osmosis RO is the phenomenon of water flow through a semi permeable membrane that blocks the transfer of salts and other solubles through it. It is able to reduce TDS of water up to 95-98%. It bifurcates water flow into permeate and reject water. Ultra Violet Sterilizer/ Ozonator Water passes through a clean chamber where it is exposed to ultra violet (UV) light which effectively destroys bacteria and viruses. Its advantages are that it does not leave any smell or taste in treated water. Water Purification Plants using RO technology can be designed for various capacities ranging from 500-20,000 liter/h input raw water and can be made in FRP / complete SS models.