If you have a .5 rise in pH coming out of the soil, then your soil is probably even higher than that, I would guess at 7.5, maybe even a little higher.Once you run your test thru the soil only you will know.
McDanger Reviewed by McDanger on . How does perlite effect PH? I probably have a very simple question. Here's some background info. My Amish friend has some babies in 16oz keg cups, they look great, and are still in the "seedling" stage of life. All is well, however, when watering with RO water, adjusted to 6.8, (and even down to 6.7) the ph of the runoff still comes out at roughly 7.2-7.28? The soil is foxfarm lightwarrior, and the very bottom inch or two is solid perlite. (Hoping to aide drainage although the fflw is very light and seems pretty Rating: 5