The PULSAR Shadow sets a new standard for the mechanically actuated dThe PULSAR Shadow® sets a new standard for the mechanically actuated diaphragm metering pump. It features rugged and reliable construction, delivering superior value. The Shadow is easy to operate and simple to maintain. The Shadow HYPOPump configuration is the ideal choice for sodium hypochlorite or other off-gassing and difficult to handle fluids. It is commonly used in water & wastewater treatment.iaphragm metering pump.