The Turbo Mixer propeller mixer from Vaughan Company is mounted vertically inside an 18-inch elbow. It can mix a pit with only 1 foot of liquid above the floor and incorporates an upper cutter above the propeller to stop wrapping and fibrous material binding and to protect the mechanical seal. It can be belt- or gearbox-driven and can be used in anoxic zones, oxidation ditches and mixed liquor applications. 360/249-4042; www.chopperpumps.com.