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Zoe Davis——Studied at the University of Tokyo, Lives in Tokyo, Japan.
Water Hardness Scale | Grains Per Gallon | Milligrams Per Liter (mg/L)or Parts Per Million (ppm) | Classification | less than 1.0less than 17.1Soft1.0 - 3.517.1 - 60Slightly Hard3.5 - 7.060 - 120Moderately Hard2 more rows
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