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31
was a certain amount of Thames-derived filtered water supplied to
the area.
Bacteriological analyses of these wells are made five times a
week and consistently satisfactory results have been obtained from
samples of water passing into supply. Chemical analyses are also
made at regular intervals.
All supplies are treated with chlorine at 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 the consumer.
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.
The following table gives the results of chemical and bacteriological
analyses of the various supplies to Orpington during 1959,
including analyses of water before treatment."