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These filters are rectangular in shape, and possess the
disadvantage of having square corners where it has been generally
supposed the filtering media can lie undisturbed and thus become
foul. However, after three years' continuous use the whole of
the filtering media was removed from the beds, and it was found
to be perfectly clean and free from stalcness. This is a proof of
the efficiency of the modern method of filter washing.
This plant is capable of treating 27,000 gallons of water
per hour, which has proved sufficient to maintain the water in the
pool in a satisfactory condition. The sterilisation plant in this
particular case has failed and is beyond repair, so Chloros and
Voxsan are added periodically to the water to maintain a free
chlorine content of .3 to .5 parts per million.
Four filters have been installed at the Romford Road
establishment, and for the general work are so arranged that the
water from the major pool is treated in two filters, while the water
from the minor and model pools passes through the remaining two
filters. Both sets are operated by separate pumps and a stand-by
set is available for either service. Chlorine and ammonia are
available, forming the chloramine treatment for sterilisation. Two
pumps operate this service; each is capable of delivering 60,000
gallons per hour. Pipe lines and valves are so arranged that the
whole of the plant can be connected to any single pool. Daily
tests are taken of the water in each pool, and an endeavour is
made to have .3 to .5 parts per million free chlorine available with
a PH value of 7.
Samples of water have been taken for bacteriological examination.
They were found to be satisfactory. For this purpose
water was taken from the pool during ordinary bathing periods.
Having in mind the value of a high chlorine content in bath
water and also of the irritating effect which this has upon bathers,
I have for years made a rule of maintaining a free chlorine content
in the bath water at the figure previously given, but in addition to
that I have added lime direct to the bath on every Sunday morning
immediately the pools have been closed to the public. Sufficient
lime had been added to bring the free chlorine content up to well
over one part per mlilion. Early on Monday morning the pumps
start to circulate the water, and by the time the public are
admitted the excess chlorine has gone. By this method I am
convinced that the water in the pool is rendered safe and free from
harmful bacteria.
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