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acetic acid solution add 1 ml algae alkalinity aluminium sulphate ammonia ammonia-free ammonium amount available chlorine bacteria bacteriological boiler boiling Buffer Solution calcium carbonate cent chemical chloramine clean coagulation colour copper dichloramine dilute discs disinfection dissolved oxygen distilled water dose EDTA effluent estimation filtration floc fluoride fluorine free chlorine further g of potassium hardness hydroxide iron lime litre Lovibond Nessleriser method Metropolitan Water Board mg/l micro-strainers minutes ml of distilled ml with distilled Nessler glasses nitric acid nitrogen trichloride o-tolidine obtained organic matter oxidised ozone permanganate phosphate plant pollution potassium permanganate precipitate present pressure PROCEDURE produced pump quantity raw water reaction reading REAGENTS reduced reported reservoir residual chlorine river river-derived salts sample sand filters sewage silica slow sand filters sludge sodium sodium carbonate softening standards sulphuric acid suspended matter tank temperature titration treatment tube turbidity usually washing water supply