Just to make sure I'm doing this right.
I took a 250ml flask, added 20g of CaCl2, and added distilled water to the 200ml mark.
Measured my gravity and it was at 1.070. Enter that into the formula and I get 86.07 g/L.
So if I need 6g of CaCl2 to brew I'd add 6g/86g/L = .069L (69ml), right?