Type A porous aluminum oxide is a historically popular desiccant for SCUBA air because it is non-toxic, long lasting, compositionally stable, simple to handle, and has high absorption capacity. Primarily used to remove moisture, it also has limited ability to absorb other gases and liquids. Global activated alumina is formulated as 1/8" diameter spheres. Type A has absorbing power which approaches that of molecular sieve. Packaged in a 1 gal, 6.75 lb bottle.