Venturi meter is used for -: (A) Measuring amount required for chlorination, (B) Measuring air velocity, (C) Measuring bed strength in slow sand filter, (D) Measuring dissolving capacity of gas
Answer is C. Park's textbook of preventive and social medicine 23rd edition. *In slow sand filter an impoant component of the regulation system is the venturimeter which measures the bed resistance or loss of head.