best answer > How many grains per gallon is considered hard water 2024?- QuesHub | Better Than Quora
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  • Zoe Davis——Studied at the University of Tokyo, Lives in Tokyo, Japan.

    Water Hardness ScaleGrains Per GallonMilligrams Per Liter (mg/L)or Parts Per Million (ppm)Classificationless than 1.0less than 17.1Soft1.0 - 3.517.1 - 60Slightly Hard3.5 - 7.060 - 120Moderately Hard2 more rowsread more >>
    +119962023-04-19 21:38:35

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