Just watch for tip burn as you increase the nute strength. A well developed plant will handle the increase easily. When you do see burn, record the EC/ppm- that's as far as you can go with that mix. Back off maybe 10%.

When you move to the bloom mix, do the same thing. W/ the GH, I'd run it pretty high into week 5-6 of flower and then start cutting back hard.
rhizome Reviewed by rhizome on . PPM Levels - after reading; still not sure Just some quick background. I have some California Orange Bud that is about 4 weeks in. It's in a Rockwool Hydro-Drip system and currently under a 400w Sunmaster Cool Deluxe MH light (Lights are 21-inches above tops). For nutrients I'm using the General Hydroponics 3-part system as well as Cal-Mag that is added to distilled water. Picutres attached are from week 3 and week 4 after they were seeded. I've been reading all the posts about PPM and I've used the chart Zandor provided Rating: 5