Powerful Professional VANI-SOL High Acid Bowl Cleanse dissolves even the toughest stains, including built-up lime deposits, hard-water scale and rust stains without harming septic tanks. The 23% hydrochloric acid formula is packaged in an angle-neck bottle for easier application.Professional VANI-SOL High Acid Bowl Cleanse: Use in toilets and urinals Cleans and deodorizes For use in hospitals, institutional and industrial facilities