Acceptable nutrient levels depend on the strain. I've seen plants that could take upwards of 1800-2000ppm in late flowering and love every bit; however, I've also seen some strains (blueberry especially) that can't take more than 900-1000.

Keep raising it slowly week after week and wait for the very tips of your leaves to get nute burn. Once they do, keep it there for a while or back it off a bit.... trial and error
gainesvillegreen Reviewed by gainesvillegreen on . Nutes and ppm's during flower... Hi all, I am just over 20 days into flower and want to maximize yield by adding enough nutes without over doing it. I think I may be going a little too light. I'm using GH 3 part nutes and growing in soil with 25% perilite. Here's my nute schedule for the last few weeks, 1'st number is Gro, 2'nd is Micro and 3'rd is Bloom, numbers are in ml. I have also included TDS when measured, but you can add another 150 ppm to those numbers because I use baking soda to lower the PH which causes TDS to Rating: 5