Activated alumina is a porous, granular form of aluminum oxide that is commonly used as an adsorbent. It has a high surface area, which allows it to effectively remove impurities and contaminants from liquids and gases. This material is often utilized in water treatment, air purification, and as a desiccant to control moisture. In addition to its use in filtration systems, activated alumina can also be employed in the production of catalysts and in the pharmaceutical industry. Its ability to absorb fluoride and other harmful substances makes it valuable for ensuring safe drinking water, particularly in areas affected by high levels of fluoride.