The wet ep uses water flushing systems to remove the particles from the collecting surface. The gas stream is either saturated before entering the collection area or the collecting surface is continually wetted to prevent agglomerations from forming. Some mist aerosols simply gravity flow down the collecting surfaces. A wet ep system is effective on acid mist, oil and tar based condensed aerosols, or applications where dry dust particles combine with condensables to form paste like residues. Due to the environment, wet ep control equipment is typically fabricated out of corrosion resistant materials such as stainless steel or special alloys.