The S4CSL submersible 4-inch hydraulic-driven sand slurry pump from Hydra-Tech Pumps includes a built-in agitator used for stirring up solids. It has hardened alloy wear parts and is designed to be used in applications where settled solids must be put into suspension and pumped away with the discharge water. Primary applications include desilting ponds, lakes and streams; other uses include filling sand bags to prevent beach erosion, tank and digester cleaning, or pumping sediment from caissons. It requires hydraulic inputs of up to 17 gpm at 2,800 psi, and when combined with HT20 to HT35 open and sound-attenuated power units, is capable of output flows to 750 gpm. 570/645-3779; www.hydra-tech.com