that's not actually true...good point OmegaV...I forgot that one.
ph/up down is not made exclusively for hydroponics...and you never just dump it in the pot full of soil...You mix with ro/distilled water and ph it 1st.

and if you did screw up your soil...you can leach it...that means to flush it with 3-6 times tthe capacity of pot...If you are using 3 gallon pot, then you must use 6 gallons of ph'd water to flush it completely...some old schoolers put the whole plant in the shower for 20 minutes. If you do, make sure you do it early in the photoperiod, so that the buds have time to dry out..peace

I would take heed of the info you have here; Some of it is "WRONG".

goodluck read read read