Used as a stand-alone fixed-bed bioreactor (FBB) or as an augmentation to an activated sludge process, IFAS technology will increase the amount of treatment capacity by increasing the amount of biomass available to do the work. Whether the use if for BOD elimination only, nitrification, or full Biological Nutrient Removal (BNR), the high surface area offered by the media provides the ideal environment for the hard working microorganisms to grow.