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51
be reduced to a four hourly period when the number of bathers
renders that desirable. The chemical process provided consists
of adding small quantities of ammonia gas to the water immediately
after its passage through the sand filters, followed by the
introduction of chlorine gas solution. The effect of filtration is
intensified by adding- sulphate of alumina and soda crystals in
carefully regulated quantities, thus maintaining the requisite
alkalinity of the water and ensuring the coagulation of impurities.
Adequate aeration has been provided by two specially
designed cascades over which the water falls previous to chlorination
and its entry to the pool. The water was maintained in a
high standard of purity throughout the whole of the season.
The Council have in addition decided to modernise the swimming
pool at West Hendon and for this purpose the surrounds of
the bath and the dressing accommodation are being greatly
improved and an up-to-date filtration plant installed.
There is one private swimming pool in the area.