Greg I send a email regarding this same question to Ocean Fresh Aquarium Products about their mixing instructions. Here is a quote of the email I got. If this is wrong and someone knows please speak up.
"Coral Grow mixing instructions
CA
The concentration that I use here is 72gram/liter of Calcium Chloride. CaCl weighs 194grams per cup. So add 1.5 cups to 1 gallon of ro water. Do be careful as it generates heat as it dissolves so only use cold water.
KH
The concentration that I use here is 84 gram/liter of Sodium bicarbonate aluminum free. It weighs 290grams per cup. So add 1 cup and 1 teaspoon to 1 gallon of ro water. Stir this until dissolved, heating it a bit may help as well. Dont add it all at once but do it gradually over five minutes while stirring constantly.
*
Mg
The concentration that I use here is 55gram/liter of Magnesium Chloride. MgCl weighs 225grams per cup. So add 1 cup to 1 gallon of ro water and also add 1 teaspoon of deodorant free Epsom Salt.
Once you have tested your system and have the pumps properly set I would not change the concentrations of the mixtures.
For calculations I assumed there is 4 liters in a gallon."
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