A scrubber or scrubber system is a system that is used to remove harmful materials from industrial exhaust gases before they are released into the environment. There are two main ways to scrub pollutants out of exhaust, and they are: Wet Scrubbing The removal or harmful components of exhausted flue gases by spraying a liquid substance through the gas. Dry Scrubbing The removal of harmful components of exhausted flue gases by introducing a solid substance to the gas -generally in powdered form. Both of these methods work similarly and perform the same process of removing J)Ollutants. The main difference is the materials they use to filter the gases. By removing acidic gases from the exhaust before it is released into the sky, scrubbers help prevent the formation of acid rain.