Great spreadsheet, very intuitive, but there is one aspect I am not understanding.
Existing water: Calcium 35, Magnesium 12, Sodium 9, Chloride 15, Sulfate 27, Bicarbonate 124
w/ 1.5g gypsum: Calcium 58, Magnesium 12, Sodium 9, Chloride 15, Sulfate 82, Bicarbonate 124
Assume for example 4...