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Description A highly corrosive, strong mineral acid. Used to etch concrete and brick surfaces. Has major industrial uses and is a common laboratory reagent. Used for pickling of steel to remove rust or iron oxide scale from iron and steel. Lowers pH levels in water. Spirits of Salt Common Uses Brick & Paver Cleaning Concrete Cleaning Surface Rust Removal Acid Washing Reduces Alkalinity Reduces pH Levels Acid Brick Cleaner Concrete Etching