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36
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 algae in the water.
In order to assist in the cleansing and efficient working of
the filters, a coagulent 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.
INSPECTION AND SUPERVISION OF FOOD:
1,974 inspections were made at premises where food
intended for sale for human consumption was prepared, stored
or sold.