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Water with hardness of 25 ppm = 25 mg. of or the test strip changes color (on a scale, for example) that is compared to a standard provided with the kit. One grain per gallon (gpg) is equivalent to parts per million (ppm). Water hardness can be measured in gpg or ppm, but gpg is the most commonly used. The hardness of your water will be reported in grains per gallon, milligrams per liter (mg/l) or parts per million (ppm). One grain of hardness equals

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The table below is provided as a reference. Water Hardness Scale. Grains Per Gallon. Milligrams Per Liter. (mg/L)or Parts Per. Million (ppm). Classification. Hardness is the measure of mineral content in the water. equivalent to parts per million (ppm). water and can cause formation of scale inside pipes. EASY TO READ COLOR CHART - From red to green, the large color chart makes distinguishing The total hardness is measured in both GPG and PPM.

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Hard Water Classifications · Soft: 0 - parts per million (ppm) · Slightly hard: – 60 ppm · Moderately hard: 60 - ppm · Hard: - ppm · Very hard. Parts per million (ppm) is the modern metric system. Before that, the degree Clark method was used to measure hard water. Parts per million This scale is used. Water hardness is primarily the measurement of calcium (Ca++) and magnesium (Mg++) ions in the water. In the U.S., hardness is usually measured in ppm.