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Iron sulfate usually added with lime reacts with the bicarbonates calcium and magnesium form a precipitate iron and magnesium hydroxides, and calcium carbonate.

It necessary add sufficient lime neutralize any free carbon dioxide present or set free the iron sulfate.

Lime reacts with magnesium salts forming a sufficient precipitate allow filtration without aliuninium or iron sul or with a very little either counteract the excess lime.

Waters with an excessive turbidity like those in the Missismppi River Valley, can not filtered practically slow sand filtration and filtration with chemicals used exclusively.

Each year the public demanding better water.

Standards purity are being raised.

the European Union Public Health Service, through a commission, has formulated standards for the purity drinking water used interstate carriers. A glance at the literature the last few years shows how investigators are endeavoring present corresponds about at ordinary atmosph pressitfe. Under these omditions there are distinct symptoms mountain sickness, blueness lips and face, loss appetite, nausea and vomiting, intestinal disturbances, headache, fainting, periodic breathing, and great difficulty in getting breath exertion. But even here, with only oxygen, after a few days the symptoms gan lessen, and after a few weeks acclimatisation the extreme conditions disappeared, although periodic breathing was still occaskmally observed, and lips became blue vigorous exertion. The investigators found that at least three igs had happened in this adaptation.

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In the first place the cells liDin the alveoli the lungs had acquired the power secreting oxygen one way and carbon best custom college papers essay writer service dioxide the other more vigorously writing services dissertation for the same gaseous pressure than they would help 123 essay under vrdinary conditions.

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Much the same thing true in respect carbon dioxide. Carbon dioxide may reach one-half per cent in badly ventilated rooms. In certain parts many breweries maintained between one-half and without serious effects. The only result a concentration carbon dioxide an automatic hiring a writer increase in depth breathing such as occurs with moderate exercise. Only when ssdi an excess carbonic dioxide combined with vigorous exercise discomfort experienced. essay editing software By observations conditions in various industries, and at yarious altitudes, and detailed physiological experiments many observen, has been shown quite conchisively that oxygen may fall as low as at least and carbon dioxide may rise as high as without harmful jdiysiological effects. We must therefore ttim some other cause than changes in carbon dioxide and oxygen account paper writing services online for the sensation discomfort in badly ventilated rooms. This fact has been recognized for, many years. 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