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[APD] Re: Nutrient Dosing
TW: "In mg/L: Calcium 12, Magnesium 15, Total Hardness (as CaCO3)
93, Total Alkalinity (as CaCO3) 66"
JP: "You don't need to add either Calcium or Magnesium nor adjst
the Alkalinity given those readings. You do know that the
reported results as CaCO3 doesn't necessarily mean that CaCO3 is
the sole diatomic cation responsible for the water's hardness.
Any +2 cation will contribute to water hardness, but Ca+2 and
Mg+2 are the most common. The readings are reported as ppm (mg/l)
CaCO3 purely as convention."
But if Ca+2 and Mg+2 are the most common, why don't their values
add up to most of the other two values? (12+15 versus 93 and 66)
Sorry if that's a dumb question, just trying to grok the
relationships here. And, "given those readings" where do these
values fit in along the spectrum of possiblities? Are they high
or just average?
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