The Kolhapur Municipal Corporation in Maharashtra has commissioned the Rankala lake water purification plant. The plant, which has the capacity to treat 1 million litres of water per hour, was set up at a cost of Rs 250 million. It uses the hydrodynamic cavitation technology to treat raw water, which involves the formation of cavities or bubbles in the water which are subjected to high vapour pressure to break down complex pollutants and organic molecules.