GrowerXLT- I had the exact same problems as you and moreover on my last grow. Once I talked to snoop, i immediatly dropped my ppm and stuck to his sched for the h202. While I was scrubbing out the rez i also opted to cut off all dead growth on the roots to eliminate as much of the dead matter as I could(I used my fingers and gently pulled out the bad stuff). Within a week I had healthy new roots exploding from the hydroton. Also everytime I changed my rez(weekly) I checked on the roots. It seemed like every couple of weeks I would have to cut out a small clump of dead roots but overall I was seeing more new growth than I was dying growth. One more thing, I also lowered the gph because I think that the pump I was using was pumping so much water that the roots were literally getting saturated. Dont know if this had anything to do with it but Im just trying to help, hope everything works out for the both of you.-Diz:rasta: