Water high in mineral content -- specifically calcium and magnesium -- is more commonly known as "hard water".
There's no negative link between hard water and human health, but hard water has been known to mess with a homeowner's penchant for cleanliness. Over time, mineral deposits can collect and "stain" anywhere that there's running water.
In the home, hard water stains are most commonly found in bathrooms.
In this 2-minute video from Rachel Yatuzis, we see the Hard Water Stain Remedy in action. It doesn't take much time, or even much effort. Removing the stains can be as simple as mixing lemon juice, vinegar, and baking soda.