Berkefeld filter

Berkefeld filter

A Berkefeld filter [ [ Definition: Berkefeld filter from Online Medical Dictionary ] ] is British water filter made up of diatomaceous earth (called "Kieselguhr" [|] taken from the name of the mine in Hanover, Germany where it was mined) used since 1891. It was named after the owner of the mine.

It is a good bacterial water filer used in Microbiological laboratories and, home water filter, and also in the field. [Textbook of Microbiology by Prof. C P Baveja, ISBN 81-7855-266-3] [Textbook of Microbiology by Ananthanarayan and Panikar, ISBN 81-250-2808-0]

Design and mode of action

Usually these are made up of two metal or plastic cylinders sitting on top of each other. The upper one has a lid opening which, one can fill it with water. The upper cylinder communicates with the lower through a channel in the intervening guarding which sits one or more porcelain filter columns. The water, after purification trickles down to the lower chamber and gets stored. It is tapped out as and when required.

Sometimes the filters are fitted with a carbon core [ FAQ from British Berkefeld on New Millennium Concepts ] ] to act as a deodorizing adsorbent. They may also have a silver impregnation to inhibit bacterial growth. They also remove certain microscopic fungi and particulate matter depending on its grade of porosity.

These filters act as "gravity filters." Water gravitates through the porous material from the upper to the lower container while being cleaned of particulate matter that get trapped in the porcelain. [ SafeTrek Survival Foods - Dried and Dehydrated One-Year and Four-Year Packages ] ]

It is sterilized by autoclaving or by steam sterilizer, after thorough cleaning.


Depending on the diameter of the pores of the earth, these are of the following types:
#V ("Viel") - Coarsest pores
#N ("Normal") - Intermediate sized pores
#W ("Wenig") - Finest pores


It is cheap, portable, and a good bacterial filter in general though it is not a filter for viruses like Hepatitis A and mycoplasma. Some companies claim that they filter out from between 100% of particles above 0.9 micrometre to 98% of particles above 0.5 micrometre in diameter. These are very durable filters and the filter elements may be cleaned over 100 times before their replacement becomes necessary.


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Look at other dictionaries:

  • Berkefeld-Filter — Bei dem Berkefeld Filter handelt es sich um eine Erfindung des deutschen Ingenieurs Wilhelm Berkefeld zur Reinigung und Entkeimung von Trinkwasser. Bei dem 1891 erfundenen Filter handelte es sich um einen Hohlzylinder aus Porzellan mit… …   Deutsch Wikipedia

  • Berkefeld-Filter — Bẹr|ke|feld|fil|ter auch: Bẹr|ke|feld Fil|ter 〈m. 3〉 Bakterienfilter für Flüssigkeiten, bes. Trinkwasser [nach dem Erfinder Wilhelm Berkefeld, 1836 1897] * * * Bẹrkefeld Filter   [nach dem deutschen Erfinder W. Berkefeld, * 1836, ✝ 1897], aus… …   Universal-Lexikon

  • Berkefeld-Filter — Bẹrkefeld Filter [nach dem dt. Fabrikanten Wilhelm Berkefeld, 1836 1897]: für Bakterien undurchlässiger Filter (Hohlzylinder aus gebrannter Kieselgur) …   Das Wörterbuch medizinischer Fachausdrücke

  • Berkefeld — ist der Familienname folgender Personen: Wilhelm Berkefeld (1836–1897), deutscher Ingenieur Siehe auch: Berkefeld Filter Diese Seite ist eine Begriffsklärung zur Unterscheidung mehrerer mit demsel …   Deutsch Wikipedia

  • Filter [1] — Filter. Strömt eine Flüssigkeit so durch einen porösen Körper, daß die in ersterer enthaltenen Suspensionen dem letzteren durch Adhäsion verbleiben[26] oder sich vor demselben festlegen, so nennt man den Vorgang Filtration, den Körper das Filter… …   Lexikon der gesamten Technik

  • filter — 1. A porous substance through which a liquid or gas is passed in order to separate it from contained particulate matter or impurities to sterilize. SYN: filtrum. 2. To use or to subject to the action of a f.. 3. In diagno …   Medical dictionary

  • Wilhelm Berkefeld — (* 1836; † 1897) war ein deutscher Ingenieur. Er erfand 1891 den nach ihm benannten Berkefeld Filter zur Reinigung von Trinkwasser. Leben Berkefeld stammte aus Lüneburg und war zunächst als Buchhalter tätig. Als Alfred Nobel nach der Erfindung… …   Deutsch Wikipedia

  • Chamberland filter — A Chamberland filter, also known as a Pasteur Chamberland filter, is a porcelain water filter invented by Charles Chamberland in 1884.[1] It is similar to the Berkefeld filter in principle. Contents 1 Design 1.1 Types …   Wikipedia

  • Bergmehl — Verschiedene Diatomeen, sekundärelektronenmikroskopische Aufnahmen Diatomeenerde aus der Slowakei …   Deutsch Wikipedia

  • Celite — Verschiedene Diatomeen, sekundärelektronenmikroskopische Aufnahmen Diatomeenerde aus der Slowakei …   Deutsch Wikipedia