QJB3/8-620 Cast Iron Submersible Mixer for Anaerobic POME Pond In an anaerobic pond the sludge blanket must stay in contact with the incoming effluent, otherwise the bottom solids consolidate into a dense layer and the working volume of the pond disappears. The QJB3/8-620 uses a 620 mm propeller at 480 r/min to produce 2400 N of thrust, enough to keep a 40 metre long anaerobic pond in motion with two or three units while consuming only 3 kW each. The cast iron housing resists