ENTEX’s IFAS systems can more than double the capacity of existing plants while simultaneously upgrading the plant’s treatment performance. This is done by adding attached growth sites for biomass, which allows for equivalent MLSS concentrations of 7,000 mg/l or more, while not increasing the solids load on clarifiers. Entex’s fixed media BioWeb can expand the capacities of an existing facility while reusing existing fine bubble diffuser systems. Entex’s moving media BioPortz allows for the maximum expansion of capacity with high-rate biological kinetics, and extremely large attached growth biological surface area. Utilizing Entex’s third generation fixed media system—Webitat—additional aeration capacity in the BioWeb module is created, resulting in an efficient retrofit, with minimal modification to the existing basin.