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You are here: Home / Water Treatment Systems / Activated Carbon Filtration

Activated Carbon Filtration

Carbon filtering uses a piece of activated carbon to remove contaminants and impurities through chemical adsorption. Each piece of carbon is designed to provide a large section of surface area, in order to allow contaminants the most possible exposure to the filter media. One pound (454g) of activated carbon contains a surface area of approximately 100 acres (1 km²/kg).[1] This carbon is generally activated with a positive charge and is designed to attract negatively charged water contaminants.

Carbon filters are most effective at removing chlorine, sediment, and volatile organic compounds (VOCs) from water. Typical particle sizes that can be removed by carbon filters range from 0.5 to 50 micrometres. The efficacy of a carbon filter is also based upon the flow rate regulation. When the water is allowed to flow through the filter at a slower rate, the contaminants are exposed to the filter media for a longer amount of time.

There are two main types of carbon filters used in the filtration industry: powdered block filters and granular activated filters. In general, carbon block filters are more effective at removing a larger number of contaminants, based upon the increased surface area of carbon. Many carbon filters also use secondary media, such as silver or KDF-55, to prevent bacteria growth within the filter.

Carbon filters have been used for several hundred years and are considered one of the oldest means of water purification. Historians have shown evidence that carbon filtration may have been used in ancient Egyptian cultures for both air and water sanitization. Currently, carbon filters are used in individual homes as point-of-use water filters and, occasionally, in municipal water treatment facilities. They are also used as pre-treatment devices for reverse osmosis systems and as specialized filters designed to remove chlorine-resistant cysts, such as giardia and cryptosporidium.

Daico Water Management

PO Box 1362
Valrico, FL 33594

800-898-2973

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