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There is vacant land available for still further increasing the
filtration area, and more settlement tanks could be provided, if
necessary. The process shows itself to be increasingly satisfactory
in comparison with other systems installed elsewhere, whether on
the score of efficiency of treatment or economy in working It
has one marked superiority in the production of a useful fertilizer
as a bye-product. The filtered effluent contains about 1-pt. per
million of Albuminoid Ammonia. It is clear, sparkling and free
from odour, and not liable to putrefraction on keeping either at
the natural temperature or in an incubator.
The sewage of Surbiton (13,000 pop.), Hampton Wick (4000)
and Kingston (88,000) produces about 2,500,000 millions daily,
but double this amount could be dealt with on the area without
nuisance. The works are in the centre of the Town and adjoin
the Canbury Promenade and Public Gardens.
Sulphate of Alumina for precipitation is now made at the
Sewage Works and the steam engines are gradually being replaced
by electric motors.
Water Closet Accommodation.
W.C's are universal in the Borough. Nearly all houses have
one or more. The Corporation provide public w.c's adjacent to
the Market Place and on the Canbury Gardens.
Pollution of rivers and streams in the District—The sources and
nature of such pollution and any action taken to check it.
The Thames is well looked after by the Thames Conservancy,
and prompt action is taken if any sewage, &c., is carried into the
river by sudden storms or if the sewage effluent is in any way
unfit.
The Hogg's Mill stream, which has been referred to, is also
under the supervision of the Thames Conservancy, the nature
of the water as it comes through the Borough is often most
unsatisfactory. The legal difficulties in dealing with nuisances in