Not sure if this will help you figure it out.

According to this link

Rex's Guide to Water Chemistry

"To raise gH use calcium chloride and Epsom salts. Add them separately or you will end up with calcium sulfate which takes a very long time to dissolve.

0.79 grams of calcium chloride and 0.33 grams of Epsom salts will raise 10 gallons of water about 1° of gH."