Carbon filtering is a method of filtering that uses a piece of activated carbon (GAC) to remove contaminants and impurities, utilizing 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 of carbon contains a surface area of approximately 500 m² (125 acres). 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. With the ability to remove chlorine, activated carbon filters are very desirable units for those using city water and those with chlorination systems.
KDF Filter Media
KDF 55 Process Medium is a high-purity copper-zinc alloy. When used in a water treatment unit, it undergoes a chemical process known as redox. Redox is short for oxidation-reduction, which is a chemical reaction where electrons are transferred between molecules. In some cases, such as free chlorine, this transfer results in the formation of benign substances, such as chloride in this case, which then passes through the filter. In a similar way, copper, lead, mercury, and other heavy metals react to plate out onto the medium’s surface effectively being removed from the water supply. KDF 55 Process Medium is so effective that it removes up to 98% of inorganic water-soluble heavy metals that are a concern to many public health officials and many consumers. In addition, KDF 55 Process Medium controls micro-organisms and reduces lime scale in problem areas like showers and tubs. KDF 55 Process Medium even changes waterborne calcium molecules that inhibit scale buildup and improves the taste of some of your favorite beverages.
KDF 55 Process Medium is the ideal complement to GAC. Because GAC removes chlorine by surface chemistry, it actually fosters bacterial growth. But, unlike carbon, KDF 55 Process Medium is truly bacteriostatic. The electrolytic field created by the redox process is an environment deadly to some micro-organisms; it also creates hydroxyl radicals and hydrogen peroxides that interfere with the ability of some other micro-organisms to function.