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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 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 16 cases, the appearance was clear and as regards the
other four, 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 4000
per ml. and free chlorine 0.01 to 5 parts per mls.
Bacteriological Examination
(a) Bacillus coli
Not found in 50 mls. 18
Pound in 10 mls. but not in 1ml. 2
(b) Number of bacteria per ml.
No growth 2
Under 5 13
6 to 10 2
801
150 1
4000 1
(c) Free Chlorine - Less than 0.3 p.p.m. 7
Fifteen of the samples were under
1 p.p.m. Of the remainder the maximum
recorded was 5 p. p.m.
(d) Chloramine - Varied from 0.165 to 1.8 p.p.m.
but in one sample there was a Nil 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 tine
by the Baths Superintendent.