The management and medical treatment of children in India / by Edward A. Birch.

  • Birch, Edward A. (Edward Alfred), 1840-1912.
Date:
1886
Catalogue details

Licence: Public Domain Mark

Credit: The management and medical treatment of children in India / by Edward A. Birch. Source: Wellcome Collection.

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    CHAP. VI. How to cleanse a block filter. “ Add teaspoonful by teaspoonful to 3 or 4 gallons, constantly stirring. When the slightest pink tint is perceptible stop for five minutes; if the tint is gone, add 36 drops, and then, if necessary, 30 more, and then allow to stand for 6 hours; then add for each gallon a solution of 6 grains of alum, and if the water is very soft, a little carbonate of soda, and allow to stand for 12 or 18 hours. If not clear, or if discoloured, filter through charcoal.”—[Parkes.] The block filter, which is the kind in most general use, should be cleansed occasionally in the following way:—Every two or three months air should be blown through, and the charcoal brushed. Then four to six ounces of Condy’s fluid in a quart of distilled water and 10 drops of strong sulphuric acid should be poured through, and, subsequently, a quarter to half an ounce of strong hydrochloric acid in 2 to 4 gallons of pure water. Three gallons of distilled or good rain water should then be poured through, and the filter is again fit for use. If sponges are used they should be removed from time to time and thoroughly washed in hot water.
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