Abstract: A wastewater treatment system integrates three tanks that oxidize organic compounds, retain solids, reduce nutrients, an inactivate pathogens, discharging an effluent that protects public health and the environment. The system homogenizes wastewater and controls its frequency, interval, volume, and rate of dosing into a treatment tank designed to develop, facilitate, optimize, and maintain dense microbial colonies both suspended in liquid and attached to engineered filter media. These colonies and filter media complete the oxidation, retention, reduction, and inactivation.