Big Bud Booster.

hi,how and when i can use BIG BUD from Advance Nutrients ??
on the bottle writes that put 2 ml / liter of water with flowering nutrients and is used in weeks 2-4 of flowering. i use every watering time ??

http://www.advancednutrients.com/hydroponics/products/big_bud/big_bud_product_information.php

but I found several versions and i want to know if anybody knows exactly.

Basically you should just follow the directions. I personally do nutes 2 out of every 3 waters full strength with reverse osmosis water. What you really need to consider is the PPM you are adding and make sure you don't get lockout. I personally have not used the advanced nutes, but alot of bloom stuff has alot of salts which can build up in the plant. Using plain water more often may be beneficial with these to clear some of the salt build up. If you're not monitoring PPM and you want just a rough number, I was say to be on the safe side, half strength, every other watering assuming RO/or distilled water. Whatever benefit you gain from using this booster will be for nothing if you over do it and get lockout.