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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 ehlorination
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 purity is maintained.
SWIMMING BATHS:
There are two swimming baths owned by the Local
Authority and one privately owned.
The purification and filtration plant at the Local
Authority's baths 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
prevention of the growth of algæ in the water.
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