Cleanser - Caustic soda / Sodium hydroxide known as Lye, this product, when dissolved in water, generates a lot of heat. Be very careful when adding the product to water. Always add the product to water and never add water to the product. Always use cold water (adding the product to hot water may cause boiling and splattering). Keep the product tightly closed in its original container. The product is a strong desiccant and absorbs enough moisture from the air to dissolve itself and become liquid. The product reacts strongly with aluminum-containing metals and produces hydrogen gas. Warning: causes severe burns. Avoid contact with skin, eyes, mucous membranes, and clothing. External first aid: flood with water. Internal: drink large amounts of water. Do not go to the emergency room or doctor immediately. Eyes: rinse with water for 15 minutes. Seek medical attention immediately. Keep out of reach of children. Hundreds of uses including: cooking / soap making / drain cleaner / acid neutralizer / chemical indicator / paper industry / degreaser / pool treatment / dryer / carbon dioxide absorption / biodiesel fuel production / aluminum waterfall / rough glass / HHO generator by electricity.