In the newspapers yesterday (10th Dec 2011), you may have read about BBMP-PNLIT collaborating with a private firm Enzen Water Solutions to clean the water in the lake using a Nano-Nutrient Solution (NNS).
Since it involved using chemicals, a trial run was done in a cement tank in the coconut grove, taking 15,000 litres of water from the dirtiest part of the lake into the tank. A week after treating the water, Enzen introduced 3 kg of Tilepia fish (22 numbers). Not only did the fish thrive but the water itself steadily gained clarity.
Before filling tank
Treating water with NNS
Water samples on Day 1
Water sample after 3 weeks