An ion separator for a water pump is provided, comprising a stator cylinder with input and output ports, homopolar north poles, and homopolar south poles, a drive shaft, a rotor core, and seals. Salt water pumped through the ion separator water pumps is desalinated by alternatively flushing out the positive and negative ions at various points as the water flows through the proposed devices. Two pump configurations are presented for use in desalination of salt water.