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Please answer both questions if possible:1)explain hardness of water and its consequences e.g. pipe scaling?

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2) describe the technology and the major steps involved in the purification of drinking water and the treatment of waste water

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  1. Water can be hard due to presence ofcarbonates and Sulphates of Calcium and magnessium.

    Water is filtered,coagulated,deminerlised or softened to remove chemicals,suspended solids

    .For drinking purpose,it is chlorinated to kill bactiria.

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