"The recommended rate is 20 ml per gallon of nutrient solution. Massive bloom Formulation will increase your PPM by approximately 400 PPM so you may have to cut back on your nutrient strength to compensate."
their own literature
i'd becareful following their instructions bwahahaha. don't expect 30 percent increase -- nutes are nutes. i'd wager monopotassium phosphate and some other stuff... they don't list the npk values so... your guess is as good as anyone else's... the limited info is enough to avoid.
save your monoey.. there are no gimmicks that magically increase yields 25% or more. if you can look at ingredients, you could reproduce the same damn thing for pennies on dollar. this stuff is more akin to prescritpion drug generics than anything that has a quality different with 'off band'