The S4CSL submersible 4-inch hydraulic-driven sand slurry pump from Hydra-Tech Pumps includes a built-in agitator for stirring up solids. It has hardened alloy wear parts and can be used in applications where settled solids must be put into suspension and pumped away with the discharge water. It requires hydraulic inputs of up to 17 gpm at 2,800 psi. When combined with the company’s open and sound-attenuated power units, it is capable of output flows to 750 gpm. 570/645-3779; www.hydra-tech.com.