A method of purging a whirlpool bathtub includes providing a pump having an off condition and an on condition, the pump configured to circulate water to a basin through a water feed line. The method further includes providing a blower having an off condition and an on condition, the blower configured to provide air to the basin through an air feed line. The method further includes turning the blower to the on condition and the pump to the off condition, and introducing at least a portion of the air from the blower into the water feed line.