When people complain about scaling inside their water kettles, this is caused by dissolved calcium and magnesium ions forming calcium and magnesium carbonate deposits when hard water is boiled.

• 民众抱怨水壶产生结垢,系硬水煮沸时其溶解性钙及镁形成碳酸钙及碳酸镁沉淀物所造成。