I entered the same batch info in both Bru'n water (paid version 5.5) and the BF Advanced calculator. I noticed a wide variance in the Calcium and Chloride. After fiddling with it I noticed that the BF calculator uses CaCl2 Dihydrate while the Bru'n water gives the option to use either Dihydrate or Anhydrous. Since the LD Carlson CaCl2 I use is anhydrous there is no way for me to be accurate using the BF Calculator. Can you add the option for Anhydrous CaCl2? Edit - my research tells me that Ball Pickle crisp is also anhydrous and I believe a lot of people use it as a salt to add both Calcium and Chloride.