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The cleaning of slow sand filter is done by –a)reversing the direction of flow of water.b)passing air through the filter.c)passing solution of alum and lime through the filter.d)scrapping off top layer of sand and admitting water.Correct answer is option 'D'. Can you explain this answer? for Civil Engineering (CE) 2025 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about The cleaning of slow sand filter is done by –a)reversing the direction of flow of water.b)passing air through the filter.c)passing solution of alum and lime through the filter.d)scrapping off top layer of sand and admitting water.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The cleaning of slow sand filter is done by –a)reversing the direction of flow of water.b)passing air through the filter.c)passing solution of alum and lime through the filter.d)scrapping off top layer of sand and admitting water.Correct answer is option 'D'. Can you explain this answer?.

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