Activated carbon that supports active microbial growth, in order to aid in the degradation of organics that have been absorbed on its surface and in its pores. Several water utility companies have become increasingly dependent on biologically activated carbons, specifically Granular activated carbon (GAC). GAC has been primarily utilized for the reduction of dissolved organic substances from various water sources. Water treatment experts have identified bacteria as one of the main features within GAC filters for being responsible in removing much of the organics. This discovery, along with the adoption of ozonation is what makes up biologically activated carbons. While the water industry in the United States has been wary of using biological organisms such as bacteria for water purification purposes, it is expected to become prevalent in the near future. Continued advancements in pre-ozonation and a greater need to combat biological regrowth in water utility systems are the chief reasons for increased usage of biologically activated carbon.