Brother just feed your plants pH'ed water for the last two weeks, that should be enough for you to get all unwanted nutrients out by the time you harvest...
Couldnt have said it better. i use FloraKleen the last couple feedings, just to make sure I get the run-off nice and clear. Just a thought. the floraKleen is cheap and effective. And it works well. You dont have to do this, Its just a suggestion.