This course is a free email series spanning three days. The course will show you how nitrox and tri-mix blending works in theory, with calculations in both Bar and PSI for filling an empty tank. The first lesson shows the formulas and calculations for filling an empty tank with a Nitrox blend. At the end of the lesson is questions that you can solve yourself. The next day, you will receive an email with the answers to the questions as well as lesson two. Lesson Two handles the formulas for blending Tri-Mix in an empty tank. At the end of lesson two, are questions you can work out on your own. On day three, you will receive an email with the answers for lesson two, as well as a bonus free book.