SORB 33TM is the name of a process that uses BayoxideŽ E33 granules to remove arsenic from drinking water. It has been developed by Severn Trent Services in cooperation with Bayer Chemicals, and is now about to make a breakthrough in the United States. The heart of SORB 33TM is a fixed bed, through which the contaminated water flows. The bed consists of iron hydroxide granules - BayoxideŽ E33 - which have been specially developed for Severn Trent by Bayer Chemicals. The granules have very finely structured surfaces in the nano range, which adsorb the arsenic.