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50
(b) Water Supplies - Miscellaneous
Four samples of sub-soil water were taken for chemical analysis. The results
indicated sewage contamination.
(c) Swimming Bath Water
105 samples were taken for bacteriological examination and all were reported
as being satisfactory.
10 samples were taken for chemical analysis and a satisfactory report was
received in each case.
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 eight swimming pools at present under the control of the council and
included is the newly reconstructed and modernised Hornsey Road Baths establishment.
This pool has been built to national standards, and is one of the finest pools in
the country with up-to-date amenities.
A modern boiler house has also been installed with electronically controlled
equipment and machinery to ensure that the building and water will be maintained at
the required temperature.
The Metropolitan Water Board supply the water for this bath.
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.
Sterilisation: 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 to 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."
The School Health Service at the London County Council Divisional Health Office,
Clerkenwell Road, reported that at a school swimming session, some children had been
affected by what appeared to be excessive chlorination. Pour of the children were
referred to hospital and received treatment for eye soreness. The children were not
detained, and the possible cause of a temporary excessive chlorination was taken up
for investigation with the Chief Superintendent of the Baths.
Seven samples of the water at Highbury Fields Open Air Swimming Pool which is
controlled by the London County Council, were taken during the summer season for
bacteriological examination. The results, included in the figures given at the head
of this section, were satisfactory and the London County council were informed
accordingly.