- If you look at a water filter, you can usually detect small chunks of charcoal inside of them.
如果你看净水器一眼，你通常会发现它们的内部通常会有一块木炭。
- Hard water ismainly caused by calcium and magnesium, which can be removed with a watersoftener.
硬水主要是因为溶在水里的钙和镁，我们可以透过净水器来除去化们。
