I am following their chart and using all three when directed. I have had no burn issues. I did run into some problems that I am 99% sure were PH related and now solved so I think I had some lockout. I also started adding in Cal-Mag and it seems to be working well. Maybe I don't need it, but since I had some lockout, I read the calcium is supposed to help absorb the other stuff. I also started adding in drip clean. I need it for my drip system to keep the tubes clean but it also helps to avoid salt buildup. You can check out my journal to see. I posted yesterday about how I diagnosed and fixed my probs from a newbie POV, good read for fellow newbies trying to figure shit out.