Hard water is water that has high mineral content (in contrast with "soft water").
Hard drinking water is generally not harmful to one's health, but can pose serious problems in industrial settings, where water hardness is monitored to avoid costly breakdowns in boilers, cooling towers, and other equipment that handles water. In domestic settings, hard water is often indicated by a lack of suds formation when soap is agitated in water. Wherever water hardness is a concern, water softening is commonly used to reduce hard water's adverse effects.
Read more about Hard Water: Sources of Hardness, Effects of Hard Water, Measurement
Famous quotes containing the words hard and/or water:
“People think that if a man has undergone any hardship, he should have a reward; but for my part, if I have done the hardest possible day’s work, and then come to sit down in a corner and eat my supper comfortably—why, then I don’t think I deserve any reward for my hard day’s work—for am I not now at peace? Is not my supper good?”
—Herman Melville (1819–1891)
“If water is too clear, it will not contain fish; people who are too cautious will never gain wisdom.”
—Chinese proverb.