Porous Structure: GAC is characterized by its extensive network of pores, which can range from micro to macro-sized. These pores create a large surface area, often measured in square meters per gram, which is critical for its adsorption capacity. Adsorption Properties: GAC has a high adsorption capacity, which means it can attract and retain a wide range of contaminants and impurities from air and water. It's commonly used to remove organic compounds, volatile organic compounds (VOCs), chlorine, chloramines, heavy metals, and certain odors and tastes.