The book Practical Domestic Hygiene was written by author James Lane Notter, Robert Hammill Firth Here you can read free online of Practical Domestic Hygiene book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Practical Domestic Hygiene a good or bad book?
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Chalk waters undergo a certain amount of purification when the lime salts which they contain are removed by pre- cipitation for softening purposes. These efforts by precipitation of lime salts usually result in some considerable carrying down with them of organic impurities held in suspension. Most public supplies of water are submitted to some process of filtration before distribution. This filtration is usually secured by passage of the water through beds of gravel and sand. The action of the...se filter beds is partly mechanical and partly chemical ; the former is the more important, as it is the means of holding back or removing micro-organisms intimately associated with those dis«ises spread by the agency of water. The Digitized by VjOOQ IC Purification of Water. 93 chemical action of filters upon water is probably due to the combined action of bacteria and air in the interstices of the sand. Distillation and boiling are frequent means of purifying water ; these methods are, however, not so general for domestic purposes as filtration.
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