Gallon, Muriatic Acid, Plastic Bottle, Also Called Hydrochloric Acid, Fast-Acting Cleaner For Brick & Mortar, Etches Concrete, Widely Used To Balance PH Of Swimming Pool Water, Strength/Concentrate Measurement: 18 Degree /28%, Read Label Carefully Before Use, Note: D.O.T. Hazardous Material Regulations Require Shipping In Full-Case Original Cartons.