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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."

Thanks James,

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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