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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 Hardness | Grains 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 row
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