Archimedes/Screw PumpsLow-head screw pumpScrew pumps from Lakeside Equipment Corporation offer built-in variable capacity that automatically adjusts the pumping rate and power consumption to match incoming flow while operating at a constant speed. They lift large volumes efficiently at low head at any treatment stage. Patterned after the Archimedean screw, the pump’s assembly consists of a simple screw, upper bearing, lower bearing and drive arrangement. The pumps offer low operating costs, low maintenance, nonclogging operation and minimal head. No variable-speed electrical controls are required. 630/837-5640; www.lakeside-equipment.com.Tube-mounted screw pumpThe Tube-mounted screw pump from Schreiber incorporates the Archimedean screw pump concept in a
