BUSINESS NOTICES
THE BERKEFELD-FILTER.
1011
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. There are two methods of sterilization, either boiling or filtering the water.
The process of boiling kills the germs, but the boiled water is rendered palatable, 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 filtering medium existed whose pores were sufficiently minute to be impassable by the minute germs, but sufficiently numerous to give a practicable quantity of
water,
The Berkefeld-Filter however fulfills both requirements perfectly and abundantly. The photograph of a particle of the filtering material as seen under the microscope, magnified 800 times, shows ladder-like and interlacing skeletons of diatomace, giving an enormous number of exceedingly small pores, thus affording a free passage for the liquid and at 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.
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, Koenigsberg, Leipzig, Marburg, Rostock, etc.
Nearly all principal Newspapers and Periodicals have written favourable articles of the Berkefeld-Filter.
TEST OF WATER FILTERS made by Surgeon-General Dr. Plagge, and published by the Medical Division of The Royal Prussian War Department, (Võl. IX, 1895), says :—
Page 00. The Kieseleguhrfilter (System Nordtmeyer-Berkelek!) show the greatest progress made in the Filter Technik during the last ten years; they are absolutely germproof, and give a flow of filtered water 6-10 times as rapid as the Pasteur-Chamberland Filter. Since three and a half years the filter has been subjected to the most severe teet and gave perfect satisfaction. Of all the filters now in existence the Berkefeld stands the highest and is the only filter that can be recommended for military purposes.
The filtering medium is a hollow cylinder of burnt infusorial-earth closed at one end. The water is forced to pass the walls of the cylinder from outside to Inside.
The excellent efficacy is caused by the innumerable microscopic pores
of the filter, which possesses the following advantages:
1. It will filter large or small quantities according to pressure, and the filtered liquid will be absolutely free from any
solid particles and from germs.
2. Each cylinder can be thoroughly sterilized by being placed in cold water, and boiled for an hour.
3. The filter can easily be cleaned by washing the cylinder with a sponge, piece of Loofah or a small brush under a tap or in a vessel of water, as all impurities remain on the surface owing to the density of the material. If after a long time of use, the pores of the surface are thus glued up with organic material, that a slight washing does not open them, take a hard brush and the surface will be renewed,
4. The filter can be used in any case, viz-a. Pressure-filter, directly fastened at the supply-pipe, will give † gallon per minute at a pressure of 40 lbs. 6. Drip-filter will give 1 pint per hour. Air-pressure-filter will filter pint per minute. c. It may be used with any pressure-pump to draw filtered water from wells and cisterns. d. It is a tourist's and traveller's companion. e. For use in Factories, Mineral Water Works, Brewers, Bleachers and all businesses requiring pure water, large supply filters are constructed by combining a great number of cylinders. Every cylinder bears the Mark, “System Nordtmeyer-Berkefeld,"
The first gallon of filtered liquid may be a little cloudy, owing to the powder or meal which is caused in boring the cylinders: after this is out, however, the filtrate will be as clear as crystal.
SOLE AGENTS FOR CHINA:
VOELKEL &
SCHROEDER
(Pharmacie de l'Union),
SHANGHAI.
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