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25
All supplies are treated with chlorine on the works, but any
excess remaining after a period of contact is removed completely
or reduced to an amount that will not be perceptible to consumers.
Tanks have been installed at North Orpington, Orpington, Bexley.
Shortlands and Wilmington to ensure an adequate period of
contact of chlorine with the water ; tanks at other well stations are
planned or are in the course of construction.
All new and repaired mains are disinfected with chlorine before
being restored to supply and samples of water from them are
analysed to establish that it is up to the normal standard of quality
expected in the distribution system. None of the supplies is
plumbo-solvent.
We have no information with regard to the proportion of the
total number of dwelling houses and population in Chislehurst and
Sidcup which are supplied from each of the above-mentioned
sources. All the premises are supplied directly and not by means
of stand-pipes.
Appended are the results of chemical and bacteriological
analyses of the various supplies to Chislehurst and Sidcup during
1953 before and after treatment."