Thanks I'll look up more on the subject myself. I thought I read that you should shoot for 50 ppm when you're doing it for this purpose.
Hey speaking of GDP, my memory clicked the other day. When they first came out (just after CG's GDP S1, which I grew and liked too), I bought them, germed and grew 6 of the 10 seeds, then pollinated a female with a male (found the seeds the other day). I'm not going to do my next grow (Critical Mass crosses); I'm gonna do (3) of these GDP x GDP, (3) 818 Headband x GDP (had it in with the GDP grow and decided to pollinate it too), (3) SLH x DJ Short Blueberry (got all males in my Blueberry grow and didn't want it to be a complete waste of dough; shook one over a SLH), and one Bubba Kush (Katsu cut; my reveg is doing bad and going too slow). I'm just looking for a female of all 3 I bred out to see what they look like, and a replacement for the Bubba reveg.