BBMP has deployed a oxygen levels As part of its experiment, the Bruhat Bengaluru Mahanagara Palike (BBMP) has deployed a small machine, called water displacer, with the hope to increase dissolved oxygen (DO) levels at Ulsoor lake. The technology -- which was dispatched from Chennai -- is expected to reduce the growth of algae and improve the aquatic life in the 120-acre lake. On Monday, the container-type machine was lowered into the water body, which was once known for dead fish and foul smell, due to the heavy inflow of domestic sewage and even industrial effluents. “This technology is different from the aerators that we have used in some lakes. The water displacer helps in bringing the deep water to the surface and vice-versa. This helps in improving the oxygen levels,” a senior BBMP official said.