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  • Zoe Wright——Studied at the University of British Columbia, Lives in Vancouver, Canada.

    Scale deposits are a typical indicator of hard water.Degree of HardnessGrains per Gallon (gpg)ppm (or mg/L)Slightly Hard1.0-3.517.1-60Moderately Hard3.5-7.060-120Hard7.0-10.5120-180Very Hard>10.5>1801 more rowread more >>
    +119962023-04-17 21:38:38

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