Clarke\'s truly heavy duty, industrial quality submersible dirty water cutter pump benefits from a corrosion resistant stainless steel drive shaft and body. It also has a sharpened, tungsten carbide cutter plate to chop and reduce any water borne sewage or vegetation. This enables the HSEC650A pump to happily pump dirty water, even sewage water, all day long and for cost-conscious, economic operation it’s also switched on and off automatically, thanks to the inclusion of a simple but effective float switch - as the water level rises this activates the pump, and turns it off once desired water level has been reached.