Mr. Nehru said the plant would be operated on a trial basis later this month. It would take at least a month for the plant to be ready for water supply. Initially, 25 mld would be supplied from the plant and the quantum would be stepped up to maximum capacity in phases in about two months. The plant would cater to a population of nine lakh in southern parts, including Velachery, Nanmangalam and Madipakkam and parts of Rajiv Gandhi Salai and Pallavaram, said a press release.