Its an additive IMO. Use your bloom micro and grow. Add an extra gallon of water mixed with kushiekush at 2ml a litre(10ml a gallon). shake it up and mix to the rest of your mix.
I would rather buy diamond nectar than kushie kush. Way better additive. Get karbo boost to. Get a bloom booster over kushie kush. Get monster bloom or big bud.
Mix it all really good before you add to the res.
Just wanted to add some info too...
My understanding of Kushie Kush is that it's only available at clubs, which is probably why so many have heard of it, but few people have used it.
From what I understand, it's a bloom booster, so yes, it's an additive to your grow, not a something that is used on its own.
http://www.advancednutrients.com/hydroponics/products/kushie_kush/kushie_kush_product_information.php
It looks like a pretty cool way to grow, I have to admit, though I'm just not very picky about the strains I grow...LOL. I just use what I can lately. I mean, it would be sweet to grow kush, but not right now. I just don't have the time and the energy, you know?
Of course, if AN is making something that will make it worth it, well...........