The wastewater treatment tank results in high quality effluent meeting what is referred to as “Secondary Treatment Standard. The tank deploys in combination an Facultative Aerobic Bacterial Generators (FABG) that includes a plurality of surrounding horizontally extending bacteria supporting filters disposed in a vertical array along with a second vertical filter media disposed between the FABG and the outlet port. A facultative bacteria generator and additional bacteria supporting filters are also deployed adjacent the FABG and between the second vertical filter media.