A filter with granular activated carbon (GAC) is a proven option to remove certain chemicals, particularly organic chemicals, from water. A Point of Entry Treatment (POET) water filtration system utilizes two GAC tanks that are connected to the plumbing system of a house or business. GAC has been classified as an EPA Best Available Technology (BAT) for the removal of many organic contaminants including PFOA.
Granular activated carbon is made from raw organic materials (such as coconut shells or coal), which are high in carbon. The organic material is heated, in the absence of oxygen, to increase (activate) the surface area of the carbon. The GAC water filtration system is filled with a large amount of the activated carbon. As water passes through the filtration system the GAC removes certain chemicals that are dissolved in water by trapping the chemical onto the surface of the carbon. There are different types of GAC water filters that can be used in a variety of different applications. This includes large scale systems for municipal water treatment, as well as point of entry or point of use systems.
Since the water testing results were issued in North Bennington, Saint-Gobain Performance Plastics has been funding the provision of bottled water and point-of-entry filtration systems for those residents whose wells test above the state limits for PFOA.