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remaining after a period of contact is removed completely or reduced
to an amount that will not be perceptible to the consumers.
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 the water in them is up to the normal
standard of water in the distribution system.
None of the supplies is plumbo-solvent.
All the houses are supplied directly and not by means of standpipes.
Appended are the results of chemical and bacteriological analyses
of the various supplies to Orpington during 1953, including analyses
of water before treatment."