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313,000 gallons. Filtration plant was installed by the Council in
two units, one in 1925 and the other in 1928, and this comprises:—
Eight cylindrical filters each eight feet in diameter;
Two aerators;
Three air compressors, and
Chlorine gas units.
Cleaning is carried out by the method of mechanical agitation.
Sulphate of alumina is used as a coagulant and the chlorine content
of the swimming bath water is maintained in accordance with the
recommendations contained in the report of 1929 of the Ministry of
Health, tests of the water being made daily and recorded.
Samples of water taken from one of the baths while there were
50 schoolboys in the water and in which 135 boys had bathed during
the morning prior to the taking of the samples were examined by
the Council's bacteriologist who reported that:—
(a) upon bacteriological examination the water was found to
be comparable with a good potable water, and
(b) chemical analysis showed the samples to comply with the
desirable standard for swimming bath water.
These examinations of samples of bath water taken under
ordinary working conditions from a bath of 73,000 gallons capacity,
filtered and treated by apparatus installed ten years ago, show that
the steps taken to ensure the satisfactory condition of the water are
adequate.
There is also an open-air swimming pool on London Fields
under the control of the London County Council.
Rats and Mice Destruction Act, 1919.
The number of complaints received during the year of premises
being infested with rats was 484. These complaints were effectually
dealt with in most cases by the repair or reconstruction of defective
sewers, drains and sanitary fittings, under the supervision of the
Sanitary Inspectors.
In 30 cases it was necessary to serve notices under the Act upon
the occupiers of the land or premises.
Six thousand, seven hundred and sixty-eight poison baits and
108 varnish traps were provided and laid down at 346 premises under
the supervision of the Sanitary Inspectors. By these means 353
premises have been cleared of rats and 18 premises were under
observation and treatment at the end of the year.