K, thanks Stinky.
So it's ok throughout entire grow, at least while using lighter dose?
I flush my flowering ladies twice, but sometimes three times if I see any signs of nute lock-out. Since I have to adjust my well water (7.9 ph) using phosphoric acid, I compensate with a little extra iron. This sometimes results in minor nute lock-out, thus requiring the extra flush. I'm still trying to find out why the nute lock-out only happens once in a while, but may be strain dependant...?

Also...I add 1tsp phosphoric acid to 5 gal of well water to get ph to 6.8ph. Any idea on how to convert this so I can figure it into my ferts N-P-K numbers? Or is that even enough to change my #'s at all.
Thanks again...RT