Table V.
Results of the Bacteriological Examination of the Pokfulam Water Supplies for the
year
1921.
Sample. Date. Rate of 'filtra-tion. Total Colonies on Agar in lee at 37° C. Coliform Organisms. Enteritidis sporogenics. Streptococci. 20 c.c. 10 c.c. 5 c.c. 0·1 c.c. Unfiltered, 3-1-21. 47 Group IV type in 5 c.c. + Filtered, 3-1-21. 7 Absent from 60 c.c. Unfiltered. 1-2-21. 45 Group II and III present in 5 c.c. Filtered, 1-2-21.. 1 Absent from 60 c.c. Unfiltered, 7-3-21. 90 Filtered, 7-3-21. Unfiltered, 4-4-21. 133 Filtered, 4-4-21. Unfiltered. 2-5-21. 23 105 Filtered. 2-5-21. 7 Unfiltered, 6-6-21. 866 + + + + + Filtered. 6-6-21. 12 Unfiltered, 4-7-21. 936 + + + + + Filtered, 4-7-21. 35 + + + + + Unfiltered, 8-8-21. 1,760 + + + + + Filtered, 8-8-21. 111 + + + + + Unfiltered, 5-9-21. 946 + + + + + Filtered, 5-9-21. 38 + + + + + Unfiltered, 3-10-21. uncountable, + + + + + Filtered, 3-10-21. 28 + + + + + Unfiltered, 7-11-21. 117 + + + + + Filtered, 7-11-21, 14 + + + + + Unfiltered, 5-12-21. 163 + + + + + Filtered, 5-12-21, 11 + + + + +
All samples were taken either immediately before or immediately after filtration. The rate of filtration is given by the Water Authority in gallons per square yard per day. Classification of the Coli group is that of MacConkey, + = Acid and Gas. Acid only, = No Change.