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1. The Metropolitan Water Board supplied selected
Thames water which has been subjected to purification
by storage in which time it is freed of the bulk
of organisms. It is filtered through rapid and then
slow filters, attaining a degree of purity which compares
favourably with the general supplies in Great
Britain, but as a further safe-guard, terminal chlorination
is applied which ensures a first-class water in
every respect. Samples of waters and filter-beds are
examined bacteriologically, chemically and for taste
and other special purposes on every working day.
2. The Colne Valley Water Company derives its supply
from deep wells sunk into the chalk and before distribution
to the consumers the water is under the
constant supervision of a chemical and bacteriological
staff which carries out examinations in modern
laboratories situated at the Works.
A high standard of piirity is maintained.
SWIMMING BATHS:
There are two swimming baths owned by the Local
Authority and one privately owned.
The filtration plant at the Local Authority's baths consists
of filters of the horizontal pressure type and cascade aerators.
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.
During the Season 20 samples were taken from the Local
Authority's Baths and 14 samples from the privately owned
bath.
PREVENTION OP DAMAGE BY PESTS ACT, 1949:
This Act came into force on the 31st March, 1950, and
repealed the Rats and Mice (Destruction) Act, 1919.
The following is a summary of the work carried out by
the rodent operatives acting under the general supervision of
the District Sanitary Inspectors:—
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