High Quality Content by WIKIPEDIA articles! Anti-fouling is the ability of specifically designed coatings to remove or prevent biofouling by any number of organisms on wetted surfaces. Since biofouling can occur almost anywhere water is present, biofouling poses risks to a wide variety of objects such as medial devices and membranes as well as to entire industries, such as paper manufacturing, food processing, underwater construction, and desalination plants. Specifically, the buildup of biofouling on marine vessels poses a significant problem. In some instances the hull structure and propulsion systems can become damaged. Over time, the accumulation of biofoulers on hulls can increase both the hydrodynamic volume of a vessel and the frictional effects leading to increased drag of up to 60% The drag increase has been seen to decrease speeds by up to 10%, which can require up to a 40% increase in fuel to compensate. With fuel typically comprising up to half of marine transport costs, biofouling methods are estimated to save the shipping industry around $60 billion per year. Increased fuel use due to biofouling contributes to adverse environmental effects and is predicted to increase emissions of carbon dioxide and sulfur dioxide between 38 and 72 percent by 2020.