Hi John
You say the following in this article about EI and it's not really accurate: "Sometimes, but not necessarily, people will add Magnesium Sulphate (MgSO4) to help with the buffering capacity of the water (measured as KH)."
MgSO4 or more commonly used MgSO4∙7H2O increases GH and not KH. Carbonates and Bicarbonates increase KH.
Take care,
Left C
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