4. Explain with neat sketch of rapid Sand filter.
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Rapid sand filters use relatively coarse sand and other granular media to remove particles and impurities that have been trapped in a floc through the use of flocculation chemicals—typically alum. ... The two types of rapid sand filter are the gravity type (e.g. Paterson's filter) and pressure type (e.g. Candy's filter).
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The unfiltered water flows through the filter medium under gravity or under pumped pressure and the floc material is trapped in the sand matrix. ... Rapid sand filters must be cleaned frequently, often several times a day, by backwashing, which involves reversing the direction of the water and adding compressed air.
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