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Anywhere In The Lower 48 States
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Number in Household |
Hardness in Grains |
Iron mg/l* |
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*One mg/l (milligram per liter) is equivalent to one ppm (part per million). There are 17.1 ppm per grain of hardness. Consider an iron filter prior to a water softener if your iron level exceeds 2 ppm of clear water iron.
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