ok so what ph do you guys that use promix ph your nutrient solution to? I had to take a 3 year break from gardening and ran into a yellowing issue in early to mid bloom.. Dont wanna run into this issue again.. Ive been ph'ing my solution to 6.5 after i tested my solution and found out i had fed at least 8-10 with fucked up ph nutrient solution... ps.... advanced nutrients ph perfect is not ph perfect, takes my nutrient solution down to 4.5... Ive quickly learned not to become to comfortable because when you do, you forget stuff and that can ruin a whole crop. I was to comfortable and totally forgot to test my ph, easy mistake that i completely overlooked