https://www.youtube.com/watch?v=5mjiBn3R1fE
https://www.jagran.com/uttar-pradesh/gorakhpur-city-revolutionary-pond-cleaning-method-transforms-gorakhpurs-moti-pokhara-23818855.html
People who saw Moti Pokhara situated in Basharatpur locality of the city a month and a half ago will not believe that this is the same pond after seeing its appearance. The pond in which water was not visible due to a thick layer of moss, after 17 days, even the boat that sank there years ago is now clearly visible.
As a pilot project, the Municipal Corporation had given the responsibility of cleaning this pond to Valiant Intake Private Limited, a Gujarat based company which is cleaning and purifying ponds and puddles in South Africa.
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He said that the power of nano bubbles, ultrasound as a catalyst and free radicals are being used to clean the decades old Moti Pokhara. The team is damaging the cells of E-coli bacteria by producing sounds of 20 thousand to 30 thousand megahertz in the water of the pond through the ultrasound machine.
This continuous process kills E-coli. On the other hand, the use of nano-bubble technology continues with the help of an 'aerator'. The aerator delivers oxygen to the bottom of the water with the help of bubbles smaller than the coronavirus. 
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