healthy house institute

4 Free HHI Books:

Creating a Healthy Household, The Healthy House Answer Book, Healthy Home Building, The Healthy House 4th Edition
Your email will only be used as described in our Privacy Policy

Follow us on Twitter



Proud Supporter of:




Evaluating Ceramic Water Filters

By HHI Staff

Protozoan cysts (i.e., Cryptosporidium parvum oocysts) in the water supply caused a number of deaths in Milwaukee, Wisconsin in 1993. As a result, many people are quite concerned about removing cysts from their water. This has resulted in ceramic filters becoming more and more common in the U.S.


article continues below ↓

We do not strictly control Google ad content. If you believe any Google ad is inappropriate, please email us directly here.

Developed in Europe in the 1860s as a result of Louis Pasteur’s new germ theory (as a cause of illnesses), they were first popularly used by the military and by hospitals, then for domestic water supplies. Within two decades, ceramic water filters were being manufactured and promoted to combat highly infectious waterborne diseases such as typhoid fever, cholera and dysentery. Not surprisingly, the use of these life-saving filtering devices soon spread to other countries and colonies where conditions often favored the transmission of illnesses from polluted water.

What is a Ceramic Filter?

While the precise composition of various ceramic filters may vary, they’re generally are made of a high-temperature-fired type of diatomaceous earth (DE). DE is a fine silica powder made up of the cell walls of microscopic algae. It seems that the specific filtering ability of a ceramic filter depends on it’s pore size, and pore size is primarily determined by the ceramic base material used and the temperature at which it was kiln fired.

How do Ceramic Filters Work?

Very simply. Water just seeps through the tens of millions of pores in the ceramic material, which is usually in a cartridge form. In this process, solids (such as many kinds of sediment and organisms) accumulate on the ceramic surface — if they’re too large to pass through. For your information, most (some filters claim as high as 99.9%) of Cryptosporidium parvum oocysts are caught through this process.

You should be aware that sometimes a silver compound is incorporated into the ceramic itself to act as a bacteriostatic agent (to counter bacterial growth on, or in, the filter). These filters are manufactured in such a manner that the silver cannot migrate into the finished filtered water. However, the U.S Federal Trade Commission (FTC) reported that filters with bacteriostatic additives “have shown unpromising results.” In other words, silver does not meet the FTC’s anti-bacterial expectations of effectiveness.

Today, ceramic filters can be purchased as stand-alone, counter-top, gravity-feed models (no added water pressure is required to make the water pass through the filter) or combined with activated charcoal in some type of filtering cartridge. Often, manufacturers will suggest periodically washing the ceramic off. Depending on the kind of cartridge, it may last 6-12 months. (Read manufacturer’s product literature to be certain.)

The Downside

Drawbacks include the fact that volatile organic chemicals (VOCs), chlorine and other undesirable odor and taste compounds, will remain in the treated water after ceramic filtering. (Of course, ceramic filters can be combined with other filtering strategies.) Also, regular filter cleaning must be performed. If forgotten, or considered an unnecessary chore, the outer ceramic surface could become so clogged with contaminants that water no longer freely passes through the filter.


From Creating a Healthy Household: The Ultimate Guide For Healthier, Safer, Less-Toxic Living, © 2000 by Lynn Marie Bower. Used by permission. 


HHI Error Correction Policy

HHI is committed to accuracy of content and correcting information that is incomplete or inaccurate. With our broad scope of coverage of healthful indoor environments, and desire to rapidly publish info to benefit the community, mistakes are inevitable. HHI has established an error correction policy to welcome corrections or enhancements to our information. Please help us improve the quality of our content by contacting with corrections or suggestions for improvement. Each contact will receive a respectful reply.

The Healthy House Institute (HHI), a for-profit educational LLC, provides the information on as a free service to the public. The intent is to disseminate accurate, verified and science-based information on creating healthy home environments.


While an effort is made to ensure the quality of the content and credibility of sources listed on this site, HHI provides no warranty - expressed or implied - and assumes no legal liability for the accuracy, completeness, or usefulness of any information, product or process disclosed on or in conjunction with the site. The views and opinions of the authors or originators expressed herein do not necessarily state or reflect those of HHI: its principals, executives, Board members, advisors or affiliates.

Evaluating Ceramic Water Filters:  Created on February 22nd, 2007.  Last Modified on February 28th, 2011


We do not strictly control Google ad content. If you believe any Google ad is inappropriate, please email us directly here.



Information provided by The Healthy House Institute is designed to support, not to replace the relationship between patient/physician or other qualified healthcare provider.

Education Partners



Popular Topics: Air Cleaners & Air Purifiers | Allergies & Asthma | Energy Efficiency & Energy Savings | Healthy Homes | Green Building
Green Cleaning | Green Homes | Green Living | Green Remodeling | Indoor Air Quality | Water Filters | Water Quality

© 2006-2018 The Healthy House Institute, LLC.


About The Healthy House Institute | Contact HHI | HHI News & Media | Linking Resources | Advertising Info | Privacy Policy | Legal Disclaimer


HHI Info