The 1-Way Acid W20HC Spray-All is a water-driven, low volume spray applicator for applying highly corrosive chemicals such as those used to remove concrete and for aluminum brightening. 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. This solution is then projected through the discharge hose, wand and fan nozzle as a low pressure, uniform spray that is perfect for spraying down any object slowly and completely with very little runoff.