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The Doulton Ceramic Filter

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At the core of the Doulton ceramic filter element is the most basic of elements ...EARTH. This is the same substance which artisans, first in Asia then in Europe, refined into exquisite porcelain and pottery of the Shoguns and Kings. This material is Diatomaceous Earth [D.E.], a fossil substance, made up of tiny silicon shells left by trillions of microscopic, one celled algae called diatoms that have inhabited the waters of the earth for the last 150 million years.

Diatoms have one property that sets them apart from other micro organisms. They weave microscopic shells which they use for the protection and locomotion. These shells are covered with a pattern of tiny holes so regular that even the slightest change in their design usually signifies a different species. As the diatoms died, their shells survived, slowly piling up in deposits at the bottom of geological lakes and lagoons. When these lakes dried up, what remained were huge deposits of "diatomaceous earth". Today there are over 1500 uses for Diatomaceous Earth, from abrasives for toothpaste, filtering agents for water and milk, heat insulators for kilns, to polishing agents in nail polishes, and many many more.

The latest designs of Doulton filter elements incorporate pure silver impregnated into a porous ceramic outer shell [80,000,000 pores] that can trap bacteria down to as low as .22 of a micron in particle size [1/100,000 of an inch]. Laboratories consider a filtering medium with an effective pore size of .01 micron to .45 micron to be bacteriologically sterile and .45 micron to 1.0 micron to be bacteriologically safe. Regrowth of bacteria that becomes trapped either on the outside of the element or in the ceramic's pores is controlled by the silver which, on contact with water, releases small quantities of positively charged metals ions. These ions are taken into the enzyme system of the bacteria's cell and thereby neutralize it. The flow rate of the ceramic filter can be easily renewed by simply brushing its outer surface under running water. As the top layer of ceramic and the contaminants are brushed off and flushed away, a new layer becomes available. This process can be repeated dozens of times before the ceramic material is exhausted.

A Closer Look Inside


Doulton ceramic is made from Kieselguhr Diatomaceous Earth and fired at incredibly high temperatures. Over 80,000 overlapping pores make up each element. This feature provides absolute mechanical filtration to .9 of a micron (.5 ANSI). 99.99% rejection of bacteria and cysts. Bacteria and any other foreign particles are trapped on the outside of the element while the water passes through the ceramic wall to the inside of the element.


This simply means self sterilizing. The entire ceramic wall is impregnated with pure silver. Silver has been long proven
as a disinfectant which insures that bacteria trapped in the ceramic's pores are killed thereby eliminating any threat of bacteria


Inside the Ceramic shell is a post filter which is manufactured by using a treated granular carbon to form a tightly packed matrix.. This post filter provides Chemical Reduction of chlorine, pesticides, solvents, etc.

Key Features

REDUCES PATHOGENIC (disease causing) BACTERIA - Cholera, Typhoid, Salmonella, Serratia, E. Coli, Fecal Coliform, Etc.

Removes Cryptosporidium Parvum and Giardia Lamblia Cysts (Beaver Fever)

Sub-Micron Particulate Filtration

Quickly and Easily Cleaned for Prolonged Life and Outstanding Economics


Self Sterilization

Cannot "Plug Up" Internally

No Tools Required to Service

Doulton water filters have been available in the United States since since World War II and certified by the National Sanitation Foundation [N.S.F] under Standards 53 and 42 for specified products and claims:

Health Effects,
Turbidity Reduction,
Cyst Removal,
Self Sterilizing
Particulate Reduction,
Taste and Odor Reduction and are the only ceramic filters available today to be certified under both of these standards.

Doulton water filter are manufactured to the following international standards and have been tested and approved by the following independent bodies or agencies:

British Standard 5750
ISO - 9002
The World Health Organization
Department of Health [Toronto, Ontario]
Water Research Council London England
University of Arizona (USA)
Spectrum Labs (Minneapolis, USA)
National Sanitation Foundation (standards 42 & 53)
Hyder Labs, Cheshire England
Loughborough University, England
Thresh, Beale & Suckling Laboratories, England.
Clare Microbiological Laboratories, England
Severn Trent Laboratories, England
Over Many Independent Laboratories Worldwide

British Berkefeld Doulton filters have stood the test of time. Used by Royalty, Missionaries and Relief Organizations for over 140 years in over 150 countries throughout the world.

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