THE
BERKEFELD-FILTER.
No water ought to be employed for drinking or culinary purposes by human beings, which has not been perfectly purified. We know that some, at least, of the most serious of the zymotic diseases are most commonly transmitted by their germs gaining access to, and polluting the water. are two methods of sterilization, either boiling or There filtering the water.
The process of boiling kills the germs, but the boiled water is rendered unpalatable, owing to the process expelling the dissolved gases which help to give the water its gratifying taste and freshness. Nevertheless the boiling was used because no filter- ing medium existed whose pores were sufficiently minute to be impassable by the minute germs, but sufficiently numerous to give a practicable quantity of water.
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The Berkefeld-Filter however fulfills both requirements perfectly and abundantly. The photograph of a particle of the altering material as seen under the microscope, magnified 800 times, shows ladder-like and interlacing skeletons of diatomacen, giving an number of exceedingly small pores, thus according a free passage for the liquid and the same time arresting all minute suspended organic or inorganic matter on the surface. from which the deposits can be easily washed or brushed away.
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The Berkefeld-Filter has been treated in nearly all Hygienic Institutes and many Hospitals, and is in use in the Royal Institute for Infective Diseases, Berlin; City Hospital Berlin; Hygienic Institutes of the Universities of Berlin, Bologna, Breslau, Florence, Konig berg, Leipzig, Marburg, Rostock, etc.
Nearly all principal Newspapers and Periodicals have written favorable articles of Berkefeld-Filter.
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THE BERKEFELD-FILTER