The submersible sludge pump JS 15 is excellent for pumping sludge and water mixed with solids. The pump has a slim design and low weight, which makes it easy to move and easy to handle. It can run without risk of overheating the motor or sludge clogging. 50 Hz: head max 15.5 meters, flow max 10 l/s. 60 Hz: head max 18.5 meters (61 feet), flow max 11 l/s (174 gpm).