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(18) The use of stored water goes far to wipe out the gravity of the charge that the chief sources of
London's Water Supply are from sewage polluted rivers.
"(19) The use of adequately stored waters renders any accidental breakdown in the filtering arrange-
ments much less serious than might otherwise be the case.
(20) The habitual use of stored water would lighten the grave responsibilities of the Water Board, as regards the safety of the London Water Supply, and would tend to create a sense of security amongst those who watch over the health of the Metropolis."
SOURCE OF SAMPLES EXAMINED.
POKFULUM WATER.
(a) UNFILTERED WATER.
(1) From Intakes :-
Plunkett's Gap
Mount Austin Streamn
Pine Wood Nullah.....
No. 1 Syphon Intake.........
(2) The total mixed unfiltered water as it flows on the beds
(6) FILTERED WATER.
(1) No. 1 Bed
(2) No. 5 Bed
(3) No. 6 Bed
(4) No. 2 Bed
(5) No. 1 Bed
(6) No. 5 Bed
Total samples.
•
16
16
30
57
119
130
249
15
15
45
18
17
19
129
ADJUNCT SAMPLES.
Samples taken monthly from the unfiltered and filtered total water of
Pokfulum, Kowloon and Tytam Supplies
Miscellaneous unfiltered samples from Tytam and Kowloon
32 10
Grand Total of Samples
420
The 119 samples of unfiltered water taken from four different intakes were examined chiefly with the view of finding out whether they showed any essential difference from each other or from the total unfiltered water which was examined at the same time.
As each of these intakes drains a separate area of the catchment area, it was thought that if there was contamination it would show in one or other of the areas; a short description of each area will be found included with the results obtained below.
Samples of unfiltered water were also taken from the Tytam and Kowloon catchment areas for further comparison.
Of the 129 samples of filtered water examined taken from four beds, these show the results obtained with the various rates of filtration used by the Water Authority and also the different kinds of filtrate obtained when a bed is first started and when it is in full working order. In all cases a sample of unfiltered water, taken as it flowed on to the bed, was examined at the same time to show the efficiency of the filtration.
PREPARATION OF THE MEDIA.
In order to interpret the results properly, it is necessary to know something about the composition of the media used and how it was used. Briefly the media used was made as follows:-
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