SORB 33 arsenic removal systems from De Nora Water Technologies use Bayoxide E33 granular ferric oxide media for the adsorption of dissolved arsenic — both arsenate and arsenite — to nondetect levels. The fixed-bed adsorption system employs a simple pump-and-treat process that flows pressurized well or spring water through a fixed-bed pressure vessel containing the media. Adsorption is a simple, passive process. Arsenic adsorption with a granular ferric oxide media offers high predictability of the breakthrough and infrequent monitoring of performance provides optimum performance. Media life typically ranges from six months to six years, depending on water-quality levels. 412-788-8300; www.denora.com