One of the ways of improving the efficiency of a water-washing system for solids removal is to combine the advantages of the cyclone with that of the simple scrubber. In cyclone scrubber, the dirty gas is swirled around a cyclone while liquid is sprayed toward the walls of the cyclone to knock the particles out of the gas stream. Cyclonic scrubbers use a variation of the spray scrubbers where the spray nozzles are arranged in a ring and spray toward the cyclone wall. These cyclones are as effective on small particles because their mass is not sufficient to cause them to fall to the bottom of the cyclones. By adding the liquid spray, the liquid impinges on the dust particles, which makes them heavy enough to fall to the bottom of the cyclone for collection.