Cleaning of rapid sand filters is done by :

(a) providing new sand layers
(b) All of three mentioned here
(c) scraping the top layer of filter media
(d) back washing

Anurag Mishra Professor Asked on 31st December 2015 in Physics.
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    Answer: (d) back washing

    Anurag Mishra Professor Answered on 3rd January 2016.
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