Many arsenic removal technologies exist and extensive reviews of these techniques have been published. Of these removal technologies, adsorption process (use of a sorbent to filter arsenic from water) is the most common method for the treatment of arsenic-laden water. The most widely tested sorbents are activated alumina, activated carbon, granular ferric hydroxide, and iron oxide coated sand. Despite the variety of existing treatment technologies, most of them are not practical and sustainable due to several limitations including insufficient removal of toxic arsenic species from water, unable to reproduce sorbents, indiscriminate disposal of spent material, lack of instantaneous measurement of arsenic in treated water, and cost. Due to these reasons still millions of people, including arsenicosis patients, have no choice but to drink arsenic-laden water. The following link has more detailed discussion about various arsenic treatment technologies: