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  2. Here is a quick hard water ppm chart that gives you a spectrum of water hardness in parts per million (ppm): Scale Of Water Hardness (From Soft To Very Hard Water) The internationally recognized water hardness scale recognizes 4 water hardness classes; from soft, moderately hard, hard, to very hard.

  3. Hardness of Water | U.S. Geological Survey - USGS.gov

    www.usgs.gov/.../science/hardness-water

    In scientific terms, water hardness is generally the amount of dissolved calcium and magnesium in water. But in layman's terms, you may notice water hardness when your hands still feel slimy after washing with soap and water, or when your drinking glasses at home become less than crystal clear.

  4. What is the Ideal Water Hardness Level? - Quality Water Lab

    qualitywaterlab.com/info/what-is-the-ideal-water...

    Generally, the ideal water hardness level is between 075 PPM (parts per million). Any reading over 150+ PPM indicates hard water. The higher the number, the harder your water is. Soft water ranges from 0-3 GPG (grains per gallon). Water with a hardness of 3-7 GPG is considered moderately hard.

  5. An easy breakdown of the water hardness scale. 4 areas where the hardness of your water can affect your life as a homeowner. How you can test your water hardness. Keep reading to become an expert on the water hardness scale and find out how to ensure the water in your home is safe and smooth!

  6. Map of water hardness in the United States | U.S. Geological ...

    www.usgs.gov/media/images/map-water-hardness...

    In scientific terms, water hardness is generally the amount of dissolved calcium and magnesium in water. But in layman's terms, you may notice water hardness when your hands still feel slimy after washing with soap and water, or when your drinking glasses at home become less than crystal clear.

  7. Hard Water by the Numbers in GPG - HomeWater101

    homewater101.com/hard-water-numbers

    Water hardness can be measured in gpg or ppm, but gpg is the most commonly used measurement. 20,00080,000: This range signifies the grain capacity of most water softeners available on the market. Depending on your water hardness number, daily water use and the number of people in the home, you may need a smaller—or larger—grain capacity ...

  8. A Breakdown of the Water Hardness Scale - Rayne Water

    www.raynewater.com/blog/a-breakdown-of-the-water...

    Understanding the mineral content of your water requires an introduction to water hardness levels, and then comparing your results with a water hardness scale. In this article, you will learn about the difference between hard water vs. soft water and see how it affects your tap water at home.