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Hi Izzy,
Without going into the logic of a "pH Perfect" nutrient line (how does one product buffer an acidic and basic formula...this is scientifically impossible). In the majority of scenarios with our line, you're either going to need a pH up product or nothing at all. Our line is more acidic than normal tap water (6.5-7.5) so your solution, after mixing in all of the products, will come out around 5.5-6.5 If you're using coco and you want to hit that 6.3 sweet spot, you're still going to be okay with a feed pH between 6.0 and 6.5. 6.3 is optimal but consider how much more you'll actually get by bringing 6.1 up to 6.3...honestly, unless you're producing commercially, I wouldn't worry about it. Plus, you don't have to introduce a new substance to your soil...and you're saving some money.
There are a whole bunch of pH up solutions available on the market and almost all of them are concentrated potassium hydroxide diluted in distilled water and sold for $15. I can't honestly endorse any one line but we use technaflora's pH up (if that means anything). Just be warned, the shit can burn you and you only need a minuscule amount at any given time. If you overshoot your pH, you need to toss the batch...do not play the up and down buffer game.