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- 30 -
Method of Treatment
Filtration through sand filters installed by Paterson Engineering
Co. in 1935. Breakpoint Chlorination with Chlorine Gas Plants.
Frequency of Change
3½ hour turnover on each Pool.
Source of Supply
Metropolitan Water Board.
Twenty-six bath samples were analysed by the Public Analyst. It
is standard practice to record the number of bathers who have used
the bath prior to the sample being taken and the number of bathers
in the pool at the time of sampling, and the appearance of the water.
In 21 cases, the appearance was clear and as regards the other five,
the baths were being used by an unusually large number of bathers,
when the appearance was slightly cloudy. The analyses, however, revealed
bacterial counts ranging from under 5 to 4100 per ml. and free
chlorine 0.4 to 1.6 parts per mis.
Bacteriological Examination
(a) Bacillus coli -
Not found in 50 mis. - 21
Found in 50 mis. but not in 10 mis. - 2
Found in 10 mis. but in 1 ml. - 3
(b) Number of bacteria per ml.
No growth - 8
Under 5 - 10
6 to 10 - 1
11 to 50 - 4
51 to 4100 - 3
(c) Free Chlorine - Less than 0.3 p.p.m. - 3
Whilst the majority of the samples were
under 1 p.p.m. some were a little higher,
the maximum recorded was 3.7 p.p.m.
(d) Chloramine - Varied from 0.2 to 1.2 p.p.m.
but in one sample there was aNil recording.
Regular tests are made at approximately 8.0 a.m., 12.30 p.m.
and 4.0 p.m. each day by the Baths Filtermen who control the temperature
and cleanliness and spot checks are made from time to time
by the Baths Superintendent.