Distilled water? Naturally he will add cal mag to that in place of everything the distilled has taken out.

What medium are you using? Is it hydroton? Did you presoak at the correct ph? What are your ppms numbers? Consistenly high ph could be a sign of nuteburn.

I debliberately avoided answering this question originally due to the fact that the information offered to solve the problem was almost nil. The answer to his problem is listed easily if he searches ph issues since these forums are FULL of correct info on it.

That doesn't seem to bother some other folks who offer advice though, so perhaps it is I who is mistaken.