Hardness of Water

What causes hardness in water?
What are the primary minerals which cause hardness in water?
Is hardness of water harmful?
What is the milligram size of minerals in water?
How much minerals in water is considered hard water?

The water we get for our daily needs comes from natural sources – both underground as well as from sources closer to surface like the rivers or lakes.
Is hardness of water harmful?
This water needs to be treated to remove harmful and unpleasant materials like bacteria, viruses and dissolved impurities before being fit for human consumption. Even after treating, tap water may still contain some amount of minerals in it.

The primary minerals that causes hardness in water are calcium and magnesium.

When water contains 0-60 milligrams per liter (mg/L) of these minerals, it is considered to be “soft water.”
Concentration between 60-120 milligrams per liter (mg/L) is classified as “moderately hard.” while concentration of 121-180 mg/L is called “hard.”

Water which has 180 mg/L of mineral content is considered Very Hard.
The higher the concentration of minerals in water, the “harder” it is.