What type of Magnesium am I using?

[gogregerson]

I made a gallon of the improved DIY Magnesium mix using Epson salt and Magflake. My question is what do I enter in the calculator as the product I'm using? Magnesium Chloride Anhydrous, Magflake or Epson salt?

[Randy Holmes-Farley]

Use the entry for Randy's Recipes. :)