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case is 20,000 gals, per hour, thus giving a flow through the filter
of approximately 444 gals, per square foot per hour. The Ladies'
2nd Class Bath has two 6 ft. 0 in. Paterson Filters, air and water
scoured. Venturi meter attached to register the flow of water
in thousands of gals, per hour—average 10,500 gals, per hour,
giving a filtration speed of 186 gals, per square foot per hour.
A record has been made three times a day since 1930 of the
chlorine content of the water at each end of the bath and at the
filter. No record has been kept of the alkalinity, but tests are
made three times a day.
In the absence of any prescribed standards for swimming
bath water the National Association of Bath Superintendents
(Inc.) have adopted the following standards, which are observed
at the Hampstead Municipal Baths.
Procedure.
(1) Samples be taken 15 minutes after the last bather has
left the water on that day.
(2) On all occasions when samples are taken, the filter plant
and accessories shall be in full operation.
(3) The samples be taken from the baths in a position
immediately over the main outlet to the filter plant and
12 inches below the surface.
(4) A standard sterilized glass stoppered receptacle of onehalf
gallon capacity shall be used, and such receptacle
shall be rinsed in the bath water prior to taking the
samples.
(5) Any sample which shall contain any bactericidal properties
should be neutralised when taken from the bath.
(6) The samples taken shall be packed in ice, or otherwise
maintained at a temperature which prohibits incubation.
(7) To effect uniformity in procedure a period of twelve
hours should elapse before the commencement of the
examination of the samples.
Chemical standards of Bath Water.
(1) The P.H. Value shall be approximate to 7 or be neutral
to Phenolps Red.