Dear Mr. Hasan Ali. Backwash ...

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Dear Mr. Hasan Ali. Backwash and slow sand filter never go together. Back wash is not done at all in slow sand filter. I think you are thinking about reuse of sand which is scrapped from the top layer of bed. It can be done by washing of the sand separately. For further details you may contact me on sarafrv@virajenvirozing.com