less and more more and less less and less more and more
Answer Discuss in Comment
increasing the surface area of tank decreasing the surface area of tank decreasing the depth of tank increasing the depth of tank
does not require alkalinity in water for flocculation decreases pH value of water increases pH value of water does not affect pH value of water
lime sodium permanganate copper sulphate sulphuric acid
equal to that of slow sand filters in between the filtration rate of slow sand filters and rapid sand filters less than that of slow sand filters greater than that of rapid sand filters
chlorination ultra violet rays treatment lime treatment by using potassium permanganate
carbon dioxide bleaching powder sulphur dioxide chloramines
smaller larger same none of the above
copper sulphate sodium chloride sodium sulphate calcium chloride
removing corrosiveness disinfection removing hardness removing odours
"Scientists dream about doing great things. Engineers do them."
