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Would someone please provide me with the rationale behind having a Ca:Mg ratio of 3:1 and/or 4:1?

My tap water is <1dGH/dKH with approximately the same [Ca] & [Mg]. I increase hardness via CaCO3 and MgSO4.7H2O. Since mid March, I have been experimenting with various ratios of Ca:Mg (1:1, 3:1, 4:1, 1:3, 1:4) and I have not noticed anything peculiar. Therefore, I wonder if anyone has experienced anything negative that s/he can reasonably attribute to a deviation from the 3:1/4:1 Ca:Mg? Please share.

Last week, I started adding Ca & Mg in a 1:7 ratio just to see what happen so I am anxious to see how it'll turn out in the next few weeks.

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Also, folks in areas with hard water, would you please consult your water report and see what the individual [Ca] and [Mg] are? I would love to know.

Thanks a lot.
 
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