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PUBLIC SWIMMING POOLS

The water to the pools is supplied by the Metropolitan Water
Board.
Continuous filtration and chlorination of the water is carried
out the whole period the pools are in use, the period of complete
turnover of both pools being 3.5 hours. The pH.value of the water
is naintained between 7.6 and 7.8 while the chorine 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 reopened. ,
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 chemists from the London County Council
Public Health Department Scientific Branch.
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
cleaned down with an abrasive powder.
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