Eutrophication of the lake was confirmed by further studies which indicated phosphate, nitrogen and chlorophyll levels to be high; with Blue green algae (which is toxic and utilises DO in the night) called the microcystis was noted from surface to bottom of the lake.

Further studies established the presence of high concentrations of zinc and the metal content in water samples, concentration of Zn, Cd, Cr, Pb and Cu content was found to be very high in sludge samples with depth of sludge recorded as about 1.55 m (5.1 ft).

[2] The Eastern watch tower on Ulsoor Lake had a Chinese bell about 4'3" in height and 3'1.5" in diameter.

The Chinese inscription read that the Bell was cast during the reign of Emperor Chien Lung in 1741 and dedicated to the San Yuan Kung temple.

Investigations by B L Rice, led to a pensioner and veteran of the Opium War, T Cribb narrating the story of its presence in Bangalore.

The bell was struck on the hour, day and night and the sound was heard for a distance of up to 3 miles.

It cracked on being stuck with a 12lb shot one rainy night, making it useless, after which it was dismounted and given to Mr. Smith the Waterworks engineer to be placed at the Tower (p. 26,27).

Ch'ien Lung Wu nien pa Yueh chi tan kuo tai miu an.