ph down

how do i lower the ph in mg potting mix

I use lemons

vinegar works too, there is also http://www.amazon.com/General-Hydroponics-pH-Down-8oz/dp/B000FG0FA4

It's kind of strange to have someone ask about lowering MG soil PH.... most people try to raise it and complain about it being too acidic... If it was a supplement or something that was added that raised the PH too high, leach the soil.

You can use aluminum sulfate or just sulphur . Mix it in your soil like you would lime. But ya make sure you wanna lower your PH of the soil, the MG potting soil is usually acidic.