The metallic constituents of hard water are : A. Magnesium, calcium and tin B. Iron, tin and calcium C. Calcium, magnesium and iron D. Magnesium, tin and iron

The correct answer is: C. Calcium, magnesium and iron.

Hard water is water that contains high levels of minerals, primarily calcium and magnesium. These minerals can come from the natural environment, such as rocks and soil, or from man-made sources, such as pipes and plumbing fixtures.

Hard water can cause a number of problems, including:

• Scale buildup on appliances and fixtures
• Spots and stains on dishes and laundry
• Irritation to skin and hair
• Reduced soap efficiency

There are a number of ways to treat

• Using a water softener
• Adding a chelating agent
• Boiling the water
• Using a filter

If you are experiencing

Here is a brief explanation of each option:

• Option A: Magnesium, calcium and tin. This is not the correct answer because tin is not a common mineral found in hard water.
• Option B: Iron, tin and calcium. This is not the correct answer because tin is not a common mineral found in hard water.
• Option C: Calcium, magnesium and iron. This is the correct answer because calcium and magnesium are the two most common minerals found in hard water, and iron can also be found in some hard water supplies.
• Option D: Magnesium, tin and iron. This is not the correct answer because tin is not a common mineral found in hard water.