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en.wikipedia.org/wiki/Hard_water

Hard water is water that has high mineral content (in contrast with "soft water"). Hard water is formed when water percolates through deposits of limestone, chalk or gypsum which are largely made up of calcium and magnesium carbonates, bicarbonates and sulfates.

www.pelicanwater.com/blog/how-to-measure-water-hardness

Most water hardness testers measure or report hard water in grains per gallon, but some laboratories use milligrams per liter, or parts per million. One part per million (PPM) is just what it says: out of one million units, one unit is a hard water mineral.

inspectapedia.com/plumbing/Hard_Water_Measurement.php

Water hardness can be easily measured using a simple soap test kit that will measure in "grains of hardness" (a little bottle with a line marked on it which you fill to the line with water, add a drop of soap, and shake to look for suds.

homewater101.com/hard-water-numbers

Water hardness can be measured in gpg or ppm, but gpg is the most commonly used measurement. 20,000–80,000: 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 ...

watersoftenerguide.com/water-hardness-scale-chart-size-water-softener-need

Read the Water hardness scale chart to determine how hard your water is and what size of water softener do you need. Get all the answers here! ... (regularly more than 2000 pounds for every year) rather than an effectively measured, proficient model that uses 300 pounds over that year. ... How Much Does a Water Softener Cost? Hard water is a ...

www.wikihow.life/Determine-if-You-Have-Hard-Water

Hard water contains minerals, usually calcium and magnesium ions, which make soap less effective and leave scale on your dishes and plumbing. There are several tests for water hardness, ranging from an easy one you can try immediately to a more accurate test kit.

www.thespruce.com/what-is-hard-water-2718699

The term hard water is used to describe a fresh water supply that contains relatively high amounts of natural minerals calcium and magnesium and a variety of trace metals. Hard water is not bad for your health, but it can cause problems in plumbing and appliances and is considered a nuisance by many homeowners.

www.lamotte.com/en/blog/test-factors/75-measuring-water-hardness

In domestic settings, hard water is often indicated by a lack of suds formation when soap is agitated in water, and by the formation of limescale in kettles and water heaters. Wherever water hardness is a concern, water softening is commonly used to reduce hard water's adverse effects.

homeguides.sfgate.com/desired-number-grains-hardness-soft-water-81187.html

Hard water can also affect the flavor of food used in cooking and cause a buildup of scale in appliances or on objects. ... Water hardness is sometimes also measured in milligrams per liter or ...