An Introduction to Public Health by E. W. Caryl Thomas (Auth.)

By E. W. Caryl Thomas (Auth.)

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T h e y clarify the water, but cannot be relied on to render it safe. 3. —An unsuitable filter is more dangerous than none, as it converts an intermittent into a constant addition of organisms. A suitable type is the Berkefeld filter, which is a candle of compressed diatomaceous earth in a cylindrical iron case. Water enters the annular space and filters through to the central bore. B. typhosus can grow through in 4 days so the candle needs to be cleaned every 3 days, by boiling in water after preliminary scrubbing.

T h e water is flat and insipid to the taste. 2. —Chlorine is added as bleaching powder, as hypochlorous acid, or as the gas. Other chemicals are used as précipitants. T h e y clarify the water, but cannot be relied on to render it safe. 3. —An unsuitable filter is more dangerous than none, as it converts an intermittent into a constant addition of organisms. A suitable type is the Berkefeld filter, which is a candle of compressed diatomaceous earth in a cylindrical iron case. Water enters the annular space and filters through to the central bore.

Over 1000 bacteria capable 0 of growing on gelatin at 20 C . in 3 days or over 100 on agar at 37° C . in 24 hours, and which contains typical B. c. or less, is probably contaminated with manurial matter. Water should be condemned if it contains large numbers of bacteria of any kind ; B. c. ; any pathogenic organisms ; or if it gives enteritidis changes in milk cultures or ferments glucose or lactose. —There are over 2000 bodies supplying water, about one-half operating by virtue of special or general Acts, most of the others being companies or persons operating without statutory powers.

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