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Colloidal Silver Filters (CSF) are simple household water treatment devices based on a physical treatment, which does not require energy supply. CSFs use a clay candle, pot or disc made of porous ceramic materials similar to traditional ceramic filters. But in CSFs, colloidal silver is used to enhance the inactivation of bacteria and other germs. A filter set consists of two containers: the upper unit holds the ceramic coated with colloidal silver, filtering the water and killing microorganisms, while a lower unit stores the treated water. CSFs remove pathogens and turbidity from drinking water. They can be constructed with locally available material, which can contribute to the development of local commerce.