Singaporean Government supplying city water from high technology of desalination by Reverse Osmosis water treatment process followed by UV and Ozone disinfection to all area in Singapore with high water quality, hygienic and free micro organism and also challenging to private bottling water company for their water purity. They are supplying water to domestic purpose for drinking purposes. This water quality Total Dissolved Solids range is 70 – 90 ppm maintaining .