The 2-Way Acid Airless Foamer is a 2.0 GPM @ 40 PSI foam applicator for applying 2 highly corrosive chemicals, such as those used to remove concrete and for aluminum brightening, without compressed air. This acid-resistant venturi injection system uses standard city water pressure (35 - 125 PSI) to draw and blend a high concentration of acid into the water stream to create a strong solution. The solution then flows through the discharge hose to the "airless" foam wand which draws in atmospheric air to create and project wet, clinging foam on to any surface. Use ball valves to inject the 2 chemicals separately or simultaneously.