hey guys, im in need of some help with learning how to lower the ph and how to raise the ph in potted soil!! i have 2 pots and at the moment the ph in 1 of them is to high and the other is to low!! if anyone could explain to me just what it is i need to buy to raise and lower the ph in soil and how to do it, i would be very greatful for your time and the know how!!! thank u!!! )