The sand, used for filteration, should not loose weight more than

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• Rate of filteration of a slow sand filter ranges from
• The pocess of excluding large sized particles from water with the help of screens is called filteration.
• The rate of filteration
• The slow sand filter should be cleaned if the loss of head becomes more than
• Rapid sand filters are cheap and economical as compared to slow sand filters.
• The effective size of sand particles for rapid sand filters varies from
• The effective size of sand particles for slow sand filters varies from
• After cleaning the slow sand filter, the filtered water should not be used for a period of
• The length of rectangular sedimentation tank should not be more than
• The quantity of arsenic in water for domestic purposes should not be more than 0.05 ppm.