Abstract: A whirlpool injector with an air supply channel (4, 104) and a water supply channel (5, 105), a mixing space (6, 106) in which terminate the air supply channel (4, 104) and the water supply channel (5, 105), and a water/air outflow passage (7, 107) downstream of the mixing space (6, 106). A further air supply channel (10, 110) runs separately from the water supply channel (5, 105) and the first-mentioned air supply channel (4, 104), and opens outwardly via a separate air outflow passage (11, 111). When the water/air outflow passage is closed off, no water is forced into the further air supply channel. The risk of contact between water and live parts of a fan or the like in or upstream of the further air supply channel is limited considerably. The additional air outflow passage can be specifically designed for injecting air alone. The invention can also be embodied in a whirlpool system.