| Hardness | |
|---|---|
| less than 60 | soft |
| 60 - 120 | moderately hard |
| 120 - 180 | hard |
| 180 or more | very hard |
Water hardness is the amount of calcium and magnesium dissolved in the water. Here is a formula for calculating water hardness.
Water Hardness = Calcium(mg/L) × 2.5 + Magnesium (mg/L) × 4.1
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