Overhead tank cleaning in Gurgaon, Haryana : Need advice on timeline, procedure & professional Services

I stay in Gurgaon. My question is do societies have a system to clean the overhead water tanks?  Do normally societies clean the water tanks to keep the water tanks clean so that every one can get clean water. I would like to know what method currently societies follow to clean the overhead water tanks and the routine practices that are adopted. Are there any good practices or methods that are practiced in general?
Also if they are using any professional services then I would like to have the contact details for the same.

Nitin Aggarwal
agg_1975_nitin@yahoo.co.in

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