A DAF (Dissolved Air Flotation) machine is a water treatment device that separates solids, oils, and grease from water using the principle of flotation. It works by dissolving air into pressurized wastewater, creating tiny bubbles that attach to impurities, causing them to float to the surface where they can be removed. DAF systems are commonly used in industrial and municipal wastewater treatment plants to improve water quality and remove contaminants.