Apparatus for dispensing abrasive particulate material into a stream of gas, the apparatus comprising: a. a pressurized hopper for receiving particulate abrasive material; and b. a pressurized conveyor coupled to the hopper comprising a housing having an inlet for receiving particulate material from the hopper, an outlet for delivery of particulate material from the housing, and a screw located within the housing for transporting particulate material from the inlet to the outlet. Also provided is a method of dispensing particulate abrasive using said apparatus and a pipe cleaning system including said apparatus.