Hey there Beastmode, hold your horses ! I've been around a while, and what i can tell you right now is that there's nothing perfect about the pH perfect line, the advanced nutrients have other lines which are great but i cant tell you how many times folks have had issues with "pH perfect" . First off the pH is not perfect, second it's not stable. If you end up getting it , and i hope you dont, you'll absolutely have to get some pH - and pH + regardless, you'll need to measure your pH much in the same way as any other nutrient line. RO water, i dont recommend it either, that's because normal water has minerals and microbes in it that usually are quite okay even beneficial for a plant. The only time i use RO water, or filtered-to-spec water is when the cannabis is in a highly regulated market like for pharmaceutical production, and even then i prefer not to if i can get away with it. The easiest thing for you to do , is get some pH perfect (if you insist) or anything other NPK and cal mag, then add humic acid as an additive which will fix any of the pH issues (pH 6.5) . it really helps if you get humic acid , especially if you're using pH perfect from AN. Hope this helps ! 🚀