Martin, I spent the last hour playing with your software. Using my classic 5 gallons ESB recipe, I plan to add 0.1g/L of gypsum and 0.2g/L of CaCl2.
However, the estimated mash pH is 5,1 and suggest adding more alkalinity.
If I add 0.1g/L of baking soda, it says to add 1g of baking soda to...