DI-tech Activated Alumina is a pre-conditioned (acidified) granular aluminum oxide used for residential and industrial feed waters to reduce arsenic and fluoride levels. DI-tech Activated Alumina receives a special acid washing treatment to lower the internal pH of the raw media. Both arsenic and fluoride removal are negatively impacted by high pH. DI-tech Activated Alumina is based on a raw product that is NSF-61 listed and represents a BAT (Best Available Technology) by the US EPA.