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being 3.5 hours. The PH value of the water is maintained between 7.6 and 7.8 while
the chlorine content is maintained at 1.0 to 1.2 parts per million. As soon as the
last bather leaves the pool at the end of the day, and for the week-end closure
of the establishment, the chlorine content is increased to 1.5 (or even more) parts
per million to ensure sterile water when the pool is re-opened.
Wallace and Tiernam chlorinators supply the chlorine to the water and the
filtration equipment used is made by United Filters. Sulphate of Alumina is used
in required quantities in the filtering of the water and soda ash, or similar,
is used to assist in maintaining the necessary PH. value of the water. Hourly
tests are made of both pools to see that the correct PH. and chlorine values are
present. Periodical bacteriological examination of the water is carried out by
visiting pathologists from the London County Council Public Health Department
Pathological Services.
The water is maintained in such sterile condition that it is not necessary
to empty the pools. However, as the large pool is closed during the winter season,
and has to be drained down, the contents of the small pool are used to thoroughly
wash out the filters servicing this pool, and then, 50,000 gallons of water from
the large pool is filtered through both sets of filters into the small pool.
This, in effect, means that both pools are emptied down each year. While the pools
are empty opportunity is taken to thoroughly scour all sections of the pool steps
that are under water, and all glazed tiling is cleaned down with an abrasive
powder.
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