Verderhus centrifugal screw pumps from Verder combine features of centrifugal and positive displacement pumps for low-head, high-flow pumping. Centrifugal screw pumps transfer the product gently and efficiently. The open impeller allows large solids to be easily pumped, reducing the risk of cavitation, which can cause serious damage to a pump and to the production process. They can help lower both energy use and ownership costs. All models use an oil-lubricated, double-mechanical seal for reliability. Typical applications are wastewater, thickened biosolids, waste activated sludge and return activated sludge, food waste, and biogas slurries. They are available in submersible models. 877-783-7337; www.verder-us.com