Item Name: Light Boil-Dry Protection 1500W Glass Kettle Camping Cooker Tea Kettle 1.8L. Quntity: 1 setName: Glass KettleCapacity:1.7 LitersColor: coffeeSize: as showMaterial: Stainless Steel, Borosilicate GlassWhat is Hard Water?-Hard water is a kind of water that contains calcium or magnesium mineral ions that often in the form of carbonate. -These ions do not pose any health threat, but they can engage in reactions that leave insoluble mineral deposits. How to Descale/Clean the Kettle? 1. Filling the kettle with 1 cup of vinegar or lemon juice and 2 cups of water. 2. Boiling the liquid and leave it for 2 hours, then use a cloth to clean and wipe. 3. Rinse the kettle with clean water, and dry with a soft, clean cloth. 4. Repeat as needed. Package incldued: 1 set Note:It's normal if your kettle exposes spots or rust on the stainless steel bottom after the first use if the water quality in your area is so hard. *Please make