As a temporary solution, vinegar is fine. But from what I understand, ph will rise back up after a few hours. Not the optimal solution. I've been using GH's phDown (phosphoric acid) for years though. 1 teaspoon in a 5 gallon bucket brings 7.9 ph water down to 6.8ish. One gallon of the stuff lasts me a couple of years.
Rusty Trichome Reviewed by Rusty Trichome on . Need advice:Trying to adjust SOIL PH level Soil Ph level at 7-7.5 tested.I know that's high for soil. Using 3 gallon pots, Into 3rd week of grow and leaves turning yellow. Which is what told me to check PH.Anyhow added 2 tps. of Sulfur granuals (as per package directions) to each pot, mixing in to soil. Can anyone PLEASE tell me how long it will take to see results. Rating: 5