This EarthSmart refrigerator filter contains a compressed carbon block which provides tremendous capacity to remove and/or reduce impurities and sediment that may be present in your drinking water. The carbon block has millions of active sites on its surface and within the structure which can absorb impurities like a sponge, and can adsorb and hold other types of impurities on its surface like a magnet. This refrigerator replacement filter is designed to remove impurities from your water, providing you with clean, fresh-tasting water and ice. The filter is easy to install and replace, and it lasts for up to six months.