ACID Magic reduces noxious fumes up to 90% and won't burn intact skin. Due to the reduced fuming, there is less corrosion to metal structures and fixtures, including storage areas, pool equipment, and filtration systems. ACID Magic is equally active upon oxides of metal when compared to standard muriatic acid. ACID Magic is great for general cleaning, adjusting pool and spa water chemistry, etching concrete, dissolving mineral deposits, and removal of excess concrete and plaster from tools and equipment. Clean, clarify, and etch like full strength muriatic!*