what pH will fry roots?

What is the lowest pH you can leach your plant with?
not the pH to properly absorb nutrients but the pH that will not fry roots

Why, what did you do...? :wtf:

For a potting soil grow, the soil chemistry works with the water to buffer your ph, so you could go fairly low. Once. But once you do damage to the roots, you expose the ladies to a host of stressful problems.
(stressful to both of you)
Any chance you could explain before you kill your ladies?

I can not get my rockwool in check. It is really bugging me. I even started running my nutes at 5.0 and the rockwool drifts to 6.0 in no time at all. My res stays at 5.0 it does not go up.
I am thinking that I might be using to much cal-mag. What ratio of cal-mag to bloom nutes should I am for?

Have you checked over in the hydro forums? I was waiting for someone that runs hydro to step-in, but it never happened, sorry.