Chloride of lime in sanitation / by Albert H. Hooker.

  • Albert H. Hooker
Date:
1913
Catalogue details

Licence: In copyright

Credit: Chloride of lime in sanitation / by Albert H. Hooker. Source: Wellcome Collection.

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    swimming pools as very dangerous centers of infection; and the swimming pool has been suspected of causing eye, and even syph- ilitic, infection, as well as the grippe, sore throats, pneumonia, diarrhoea.“^' Aeration and filtration alone of the water in swimming pools cannot sufficiently remedy infectious conditions. The results achieved by chloride of lime in a number of universities and colleges, as Brown University, Brooklyn Polytechnic, North- western University, the Carnegie Pool at Yale, Purdue Univer- sity, are very gratifying. At Purdue the bleach was thrown over the surface of the water at the rate of 20 lbs. per 1,000,000 gallons; at Brown University 12 lbs.; at Yale 8 to 12 lbs. are used pro rata.^^^ At the Univer- sity of California^^® 15 lbs. of chloride of lime are applied once a week. Other Methods of Water Sterilization. While we are on this subject, mention ought to be made of other methods of water sterilization, which have been tried with varying success, for instance, methods based on the use of copper sulfate, of ultra violet rays, ozone, free chlorine, etc. Copper Sulphate, though discarded as a sterilizer, is still used for destroying the green algae, diatoms and other microorganic growths which cause clogging of water filters (in a ratio of about .20 per million). Sterilization by bleach has greatly lessened these filtration difficulties, and through destruction of algae growths the periods between necessary scraping of the sand surface have become lengthened. Ultra-violet rays. Their most powerful germ-killing effects are entirely marred by the fact that these rays will not permeate water unless it he absolutely clear. In presence of the slightest haziness, or certain bodies which may be dissolved in perfectly clear liquids, the ultra-violet rays will not penetrate beyond the fraction of a millimeter; into such solutions as absolutely clear wine or beer they cannot enter. Furthermore, the factor of cost also is prohibitory.^®^' Ozone, which would be for many reasons an ideal agent,