i just was doing this actually. i buy soil with a pH of about 7.0-7.5 and i like my MJ plants at 6.0-6.5 so i use regular white vinegar.
I have a pH probe which you can get cheap at Lowes or HD.
I add a cap full or two of the vinegar and mix the soil really well. Then i test pH and its usually perfect.
good luck
I have a pH probe which you can get cheap at Lowes or HD.
I add a cap full or two of the vinegar and mix the soil really well. Then i test pH and its usually perfect.
good luck