Soil PH

Forgot to say, the microbs will have a say in this matter too. If you adjust it and runoff is good, but it continues to rise back up... The only thing you can do is look into microbes to apply to the substrate or continue to battle it until end of grow (assuming no repot coming). In that context, some pH of irrigation will coutneract long enough to next irrigation.. find a happy medium eventually.

soils absorb different amounts, so it's difficult to give an estimate. 7 should be too big of a deal on its own. it's a logrithmic scale, so don't think a difference of 1 is the same anywhere but the same exact point on scale. for that matter, 7 is obviously "0". order of magnitute (x10) each integer further out. 10:1, 100:1, 1000:1 H30+:OH- or oh-:h3o+ depending on direction. pH is simply the ratio of hydronium to hydroxide ions in solution. It shouldn't take long with good runoff. That's a small jump. Keep track of what you do, and it'll be that much easier the next time.