The filtration process begins at the extraction site, where gas is produced from underground deposits. During extraction, various contaminants can enter the gas stream. The first step in filtering natural gas typically involves the removal of larger impurities, such as dirt and debris, using coarse filters. After these initial filtration steps, fine filtration processes come into play. These may include various techniques such as adsorption, membrane separation, and chemical treatment to eliminate smaller particulates and harmful gases.