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:
“I’ve been complimented for my scorekeeping, and sometimes it’s hard to tell whether it’s a backhanded compliment or not. Are the men surprised when a woman does a good job as a judge?”
—Sheila Harmon-Martin, U.S. political scientist and boxing judge. As quoted in the Chronicle of Higher Education, pp. A13-A14 (June 2, 1993)
“So when Pilate saw that he could do nothing, but rather that a riot was beginning, he took some water and washed his hands before the crowd, saying, “I am innocent of this man’s blood; see to it yourselves.””
—Bible: New Testament, Matthew 27:24.