Clarkes truly heavy duty industrial quality submersible pump benefits from a corrosion resistant stainless steel drive shaft and bodyit also has a sharpened tungsten carbide cutter plate to chop and reduce any water borne sewage or vegetation this enables the hsec651a to happily pump dirty water even sewage water all day long and for cost conscious economic operation itrsquos also switched on and off automatically thanks to the inclusion of a simple but effective float switch ndash