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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 water 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
constant supervision of a chemical and bacteriological
staff which carries out examinations in modern
laboratories situated at the Works.