Ordinary tap water in a range of materials, being heated easy Jiegou, which is home to the kettle used for a long time, a pot pipe on the same layer thick encrustation.

• 普通自来水中有多种物质，受热容易结垢，这就像家里的水壶使用时间长了，壶壁上就形成一层厚厚的水碱一样。