If you know how much your nutrient mix will lower the PH of your water, you can put the PH up or down at first.
Here is how I do it.
The PH of my tap water is 7.5 and I want 6.0 because I am in hydro during flowering.
I know that my nutrient mix will raise the PH by 2. So 7.5 + 2 = 9.5
I want...