I just used half of my TGA supersoil charge mix to make 9cu. ft. of super soil. I used 8cf of Happy Frog Potting Soil, 1cf Roots Organics Big Worm, 4L Perlite, and aprx. 12.5lbs of TGA Charge pack.
Here is what that contents of the charge pack look like. Here is my mixed supersoil.