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48
(d) Swimming Bath Water
68 samples were taken for bacteriological examination. All were reported to
be satisfactory.
By courtesy of the Chief Superintendent and Engineer of Baths and Wash-houses
the following information is included in this year's report.
There are six Swimming Pools at present under the control of the Council. The
Swimming Bath at Hornsey Road is being reconstructed. Upon completion, which is
hoped will be in 1963, there will be two Swimming Baths at this establishment.
The Metropolitan Water Board supply the water for these Baths:-
The method of treatment for purification is by chemical dosage: alumina ferric is
the coagulant used to fulfil the function of forming a film on sand. Soda ash is
the alkaline salt to counteract acidity. A pH value of between 7.4 and 7.6 has
proved most satisfactory to the swimmers using these baths.
Aeration is maintained by means of an air compressor.
Sterilization: Chlorine gas is used a residual of 0.5 to 0.75 p. p.m. being
strictly adhered to. In the summer months when heavy loads are to be expected it
is kept at 0.75 p. p.m.
The frequency of changing the baths water is governed by the flow through the
filters which in the case of these establishments is approximately once every four
hours. In the summer months when the baths are open for 12 to 14 hours daily a complete
turnover of three times per day is necessary.
Samples of the water at Highbury Fields open air swimming pool which is controlled
by the London County Council, were also taken during the summer season for
bacteriological examination. The London County Council were kept informed of the
results, all of which were satisfactory and are included in the figure given at
the head of this section. In addition two samples for bacteriological examination
were taken from the children's paddling pool in Highbury Fields. As this is also
under control of the London County Council the results were forwarded to that
authority.