I noticed that adding 1 gram of Chalk to 8 gallons of distilled water added 6.6 mg/l of Ca and 20.137 of HCO. Other calculators, EZ Water Adjustment, and Brew Smith with the same amount of water and the same amount of chalk add 13 - 13.2 mg/l of Ca and 19 - 19.8 of HCO. The more Chalk that is...