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The internationally recognized water hardness scale recognizes 4 water hardness classes; from soft, moderately hard, hard, to very hard. By definition, water hardness is the total sum of molar concentrations of calcium ions (Ca 2+ ) and magnesium ions (Mg 2+ ).
To understand the concept of water hardness, we use a handy tool called the water hardness scale. This scale measures the concentration of calcium and magnesium ions in your water and assigns a numerical value to it.
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.
What is the Water Hardness Scale and What’s a Good Score? One of the most common water issues homeowners deal with is hard water - 85% of U.S. homes have hard water. Water classified as “hard” contains dissolved hardness minerals such as calcium and magnesium.
The ideal water hardness, where water tastes good but won’t ruin your fixtures and appliances, is generally 3.5–7 grains per gallon or 17.1–120 parts per million. However, the ideal water hardness for each person depends on what level of hardness or softness they can tolerate. Some people love softened water. Some people hate it.
The permanent hardness of water is determined by the water's concentration of cations with charges greater than or equal to 2+. Usually, the cations have a charge of 2+, i.e., they are divalent. Common cations found in hard water include Ca 2+ and Mg 2+, which frequently enter water supplies by leaching from minerals within aquifers.
If you have hard water, you may wonder how hard it is. Measuring water hardness using a water harness scale helps you determine the type of softener you need.
The water hardness scale is used to define the specific hardness of water. The scale can help you understand how hard your tap water is in relation to other water hardness readings, and to make an informed decision about whether you need a water softening solution in your home or business.
Water hardness or softness is measured using grains per gallon (gpg), where one grain is equal to 0.002 ounces of calcium carbonate dissolved in 1 gallon of water. 0–3 gpg is considered soft water. 3.5–7 gpg is considered moderate and ideal.
The water hardness scale determines how hard your water is & what kind of water softener will solve your hardness problem. Learn more!