i had pretty much thought that everyone knew that you don't follow the directions on the back of the bottles as most of the times they are way too hot...
nutrient co's are in the business of only selling you more nutes, and they tend to do this by telling you to use way too many nutes so that you use more faster, so you can run out and buy more..
i always recommend, no matter what co, to start out using about 1/4 of what the bottle says to use, and every week or so bump it up another 1/4 till you either get to full strength or you see signs of nute burn, w/e comes first.. if you get burn, simply back off and leave it at that..
i used an's stuff and have never fried my plants with them, but then again, i go by the 1/4 rule of thumb.. remember, less is always more when it comes to using nutes..