APPENDIX CC - Cont'd.
1975-76 1976-77
Average dose Tonnes (mg/1) Tonnes Liquid chlorine 558 1.5 642 Average dose (mg/1) 1.6 Sodium silicofluoride 484 0.8 533 0.8 (as fluoride) (as fluoride)
Salt Water Liquid chlorine, 103 1.6 126 1.8
(12) Quality of Supply
(a) Chemical quality (values expressed in mg/1)
1975-76 1976-77 Range Average Range Average Total hardness (as CaCO3) 10-36 24 10-55 26 Salinity (as NaCl) 10-74 26 5-83 30 Total dissolved solids 27-107 53 25-125 64 Fluoride (as F) (Target level 1.0 mg/1) 0.8 0.8(b) Bacteriological quality :
1975-76 1976-77 No. taken Free from coliform orgs./100 ml. No. taken Free from coliform orgs./100 ml. Samples from treatment works and service reservoirs 3,654 100% 3,619 99.97% Samples from consumers' taps 5,113 99.67% 4,938 99.23%245
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