Well, I actually know all about flushing...surprise. Yes, I did flush about two weeks ago. I don't use pure water, you never should!!! I flush with clearex and a small amount of cal-mag. Yes, I do adjust ph too! No salt build up, as that is the reason for clearex. It is basically just sugars that break down any salts.
To whoever it was that said I used chemical nutes, you are mistaken. Botanicare is almost purely organic, it just so happens to be omri (Organic Materials Reaseach Institute) certified.
So, back to what might cause LEAF VEIN BURNING!!!