Abstract: An apparatus for outputting a solid material entrained in a fluid, the apparatus comprising a receptacle for receiving the solid material, an input for the fluid, an output for solid material, an auger for transporting the solid material from the receptacle to the output, a motor for driving the auger, wherein the motor comprises one or more cylinders each comprising a piston, a second input connected to the input so as to feed part of the fluid to the cylinders, where a cross section of a piston is at least 700 mm2 or wherein a drive transforming the reciprocating movement of each piston, relative to the cylinder, to rotation of the auger around the first axis, is configured to rotate the auger at least 20 degrees when a cylinder completes a cycle.