Hey Z, I also use GH but I use Floranova. I am less experienced with the 3-part general formulas and specifying them to cannabis and it's cycles. I have read your recomendations and others about decreasing use of Nitrogen in the last weeks of flowering. I use KoolBloom as directed in the GH phase feeding chart for Floranova. I've read that some people will use KoolBloom alone in the later weeks of flowering which makes sense since there is very little if any nitrogen in it, and has the elevated levels of "P" and "K" which helps the flowering and ripening cycle. I am in the second half of flowering and I want to try using koolbloom as my sole nutrient to reduce amount of N. If I was to use just KoolBloom at my next nute change, along with my usual supplements (calmag, hygrozyme, floraliscous plus, and silica blast), can you recomend what TDS level would be okay with just koolbloom as the main nutrient? I am weary that if I use a 1500 ppm level with JUST Koolbloom, that it may be TOO much P and K. Don't want to overdo it. WHat do you think?