preferably placed 14 to 16 inches below outlet opening 30 in applications where severe dross conditions exist requiring additional suction forces the depth of opening 42 can be increased to obtain the desired results the gas can be delivered either in a continuous or an intermittent form in either case the gas emerges from opening 42 and forms a series of spaced bubbles 44 because of surface tension the bubbles rise in the molten aluminum the rising bubbles entrap sections of molten aluminum between them and carry them upwardly in the direction of arrow 46 by applying an intermittent flow of gas as shown in fig1 the utilization of the gas can be optimized by adjusting the frequency of the bubbles 39 formation and expansion rate to match the particular application the rising bubbles induce a flow of molten metal towards outlet opening 30 generating a suction at inlet opening 28 which causes the dross located on the surface of the bath to move in the direction of arrow 48 into the inlet opening a flow is created into conduit 26 thereby scavenging the dross from inside snout housing 18 to a location outside the housing where it can be skimmed off or removed by conventional means as can be seen from the description the pump apparatus involves no moving parts exposed to the molten metal referring to fig7 and 8 dross dilution pump means 24 is similar in.