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Berkefeld filter. A Berkefeld filter[ 1] is a water filter made of diatomaceous earth ( Kieselguhr ). It was invented in Germany in 1891, and by 1922 was being marketed in the United Kingdom by the Berkefeld Filter Co. [ 2] Berkefeld was the name of the owner of the mine in Hanover, Germany, where the ceramic material was obtained.
Ceramic water filter. Ceramic water filters ( CWF) are an inexpensive and effective type of water filter that rely on the small pore size of ceramic material to filter dirt, debris, and bacteria out of water. This makes them ideal for use in developing countries, [1] and portable ceramic filters are commonly used in backpacking.
A water filter removes impurities by lowering contamination of water using a fine physical barrier, a chemical process, or a biological process. Filters cleanse water to different extents, for purposes such as: providing agricultural irrigation, accessible drinking water, public and private aquariums, and the safe use of ponds and swimming pools .
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Radio frequency (RF) and microwave filters represent a class of electronic filter, designed to operate on signals in the megahertz to gigahertz frequency ranges ( medium frequency to extremely high frequency ). It is component that is used in electronic systems to pass or reject specific frequencies and attenuate of unwanted signals within the ...
Portable water purification unit used by International Red Cross and Red Crescent. Portable water purification devices are self-contained, easily transported units used to purify water from untreated sources (such as rivers, lakes, and wells) for drinking purposes. Their main function is to eliminate pathogens, and often also of suspended ...
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