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:
“It is always dangerous to generalise, but the American people, while infinitely generous, are a hard and strong race and, but for the few cemeteries I have seen, I am inclined to think they never die.”
—Margot Asquith (1864–1945)
“Camels are snobbish
and sheep, unintelligent; water buffaloes, neurasthenic—
even murderous.
Reindeer seem over-serious.”
—Marianne Moore (1887–1972)