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Swimming Baths.
There are three swimming baths within the district used
by the Public, two, one at West Hendon and one at Mill Hill,
owned by the Local Authority and one owned privately.
The purification and filtration plant at the baths of the
Local Authority consists of filters of the horizontal pressure
type, together with centrifugal pumps, chlorination plant and
cascade aerators.
The total quantity of bath water can be passed through
the filters in four hours, but during slack bathing periods this
is extended to six hours.
After passing through the filters the water is injected with
ammonia gas in solution and then passes over the cascade
aerators and is finally injected with chlorine gas in solution
before passing into the bath. The use of ammonia and
chlorine gas is for the destruction of harmful bacteria and
the prevention of the growth of algae in the water.
In order to assist in the cleaning and efficient working of
the filters a coagulant and alkaline salt are introduced into
the water between the pumps and filters. This process has
resulted in a high standard of purity being maintained.
No. of samples taken from Municipal Swimming
Baths 32
No. of samples taken from privately owned Pool 3
Cinemas and Places of Entertainment and Licensed Houses.
During the year these premises have been inspected by
the Sanitary Inspectors and detailed reports submitted to the
respective licensing authorities.
PREVENTION OF DAMAGE BY PESTS ACT, 1949.
Rodent Control.
Rodent destruction is carried out by one Rodent Foreman
and four operatives working under the general direction of the
Sanitary Inspectors. Dwelling-houses are dealt with free of
charge, while in the case of business premises, a charge, based
on the men's time, cost of material used and overhead expenses,
is made. All treatment is carried out in accordance
with the recommendations of the Ministry of Agriculture and
Fisheries.
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