QJB Submersible Mixer Pump — Stainless Steel Wastewater Sludge Agitator The QJB series submersible mixer pump is a high speed, direct driven agitator designed for continuous mixing in municipal and industrial wastewater treatment. The stainless steel impeller creates a strong axial flow that keeps solids in suspension, homogenizes sludge and prevents sediment build-up in tanks, channels and pumping stations. Key Selling Points QJB Proven Series: the internationally recognized