The Silver Filter Company Ltd.
The product is a colloidal silver-enhanced ceramic water purifier (CWP)
Silver Filters are silver enhanced ceramic ‘pot’ water filters for household drinking water treatment manufactured in Yemen based on the open source technology promoted by Potters for Peace.
The Republic of Yemen
Household water treatment methods and products available in local market.
Goal 6: Clean water and sanitation
Locally sourced clay and sawdust are processed then mixed with water, pressed into the filter shape, fired to a ceramic state, flow rate tested to ensure production consistency and coated with silver nitrate solution.
Users can obtain Silver Filters at retail locations or from distributing organizations.
How often/when should maintenance be performed?
Silver Filters consist of a porous 10 L capacity ceramic filtering element that suspends in a 30-liter plastic or ceramic receptacle that stores and dispenses filtered water. Flow rate is 1.5-3.0 liters per hour when full.
To rejuvenate flow rate when filters clog, users scrub ceramic filtering element with a brush.
Available in country: tap for dispensing water, safe storage container, ceramic filtering element.
Until it breaks; ~2 years
Performance targets: removes bacteria, parasites, turbidity.
Field evaluation concluded filters drastically improve drinking water quality, acceptance is around 96%, significantly reduce family health expenditures related to water-borne diseases, and reduced diarrhea incidence by up to 77% over a 6 month period.
Sana’a University Water & Environment Center; Care International
Pre-filter or settle very turbid water (> 5NTU).
Evaluating the Health and Socioeconomic Impacts of Colloidal Silver Impregnated Ceramic Filters in 4 Villages in Amran Governorate
Field evaluations by Care International and Social Fund for Development.
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