What is granular activated carbon (GAC)?
Granular activated charcoal is made from raw materials (such as coconut shells or coal) that are high in carbon. Heat is used to increase (activate) the surface area of the carbon; this is why these filters are sometimes referred to as “charcoal” filters. The activated carbon removes certain chemicals that are dissolved in water passing through a filter containing GAC by trapping the chemical in the GAC. However, other chemicals, like sodium or nitrate, are not attracted to the carbon and are not removed Eventually, the ability of the GAC to bind and remove chemicals is used up and new, or regenerated, GAC is needed. It is very important that the type and concentration of contaminants, and water use, be known in order to determine the correct size of system. All treatment systems require proper installation, periodic monitoring and maintenance. Note: A reverse osmosis (RO) drinking water system may also remove certain organic chemicals. Check your RO system owner’s manual for additiona
