04-30-2013, 07:21 PM
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Originally Posted by xfatdannx
does this make sense to you?
Hardness (total) as CaCO3 11(average) 7-14(range) grains per gallon(Units)
Yes, we can convert this to our more standard units. 1 dGH = 1.042645169 grains per gallon, so the average of 11 gpg would be 11.5 dGH, which is at the high end of what we can term medium hard. This would equate to 205 ppm, which is a bit higher than your previous 150 ppm. But their 11 is "average" so your tap water test could have been at the lower end of the range, either on that day or due to your particular water source. Some municipalities obtain water from more than one source, so GH and pH can vary.