The Streaming Current Controller from Micrometrix Corp. controls polymer dosage on sludge dewatering equipment such as belt presses and centrifuges. It measures residual polymer charge in the filtrate to monitor how the process is performing. The self-flushing sensor responds to changes in mass flow and solid characteristics and automatically maintains the optimum polymer dosage. It helps produce dryer and more consistent cake, with average polymer savings of 20 to 35 percent. Process upsets are prevented with alarm outputs. 770/271-1330; www.micrometrix.com.