Hey man, make sure you rinse your hydroton like a million times with fresh water...it will blast your pH through the roof in hydro (hence why I like it as mulch with super soil). I was pH'ing twice a day in my GH PowerGrower (recirc top drip) and it still was always out of whack. I cleaned the whole thing out, soaked the pebbles in dist. water, refilled the res and it was practically perfect.
5.5-6.0 


