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The hardness of water is measured in grains per gallon (gpg), milligrams per litre (mg/l) or parts per million (ppm). (See chart below)
Grains Per Gallon Miligrams
Per Liter (mg/l)
or Parts Per
Million (ppm) Rating
less than 1.0 less than 17.1 Soft
1.0 - 3.5 17.1 - 60 Slightly Hard
3.5 - 7.0 60 - 120 Moderately Hard
7.0 - 10.5 120 - 180 Hard
over 10.5 over 180 Very Hard
You can also detect hard water in your home by examining it for any evidence of film left on your body, the build-up of scale on cooking utensils, clogged pipes, appliances resulting in reduced water flow and increased repairs high in dissolved minerals, specifically calcium and magnesium...
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