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 by ground freight only. HAZARDOUS FREIGHT! An additional $28.50 hazardous fee will be applied to your order at time of shipment. Haz fee will not appear on your email order confirmation, but will be on your invoice.