Unicus Series scraped-surface heat exchangers from HRS Heat Exchangers contain scraping rods inside each heat exchanger tube. These rods move back and forth, powered by a hydraulic power unit. The scraping system eliminates fouling from the tube wall, and the mixing of product increases the heat transfer. They can be used for large duty with viscous and fouling fluids in food, environmental and processing industries. A special version is available for evaporation applications, and can operate under vacuum for volume reduction of environmental waste to reduce shipping costs. 623/915-4328; www.hrs-heatexchangers.com.