mr_chow said:hemperfi...a pH of 7 is perfect! ...it's neither basic or acidic. don't go below 6.5 or above 8.5. soil takes a little longer to get to and recognize ph-lock...so as long as your ph stays in the range, you'll be okay.
6.5-8.5 is not a good range to be in.....this shldnt even be info given to new growers...it is straight up wrong. 6.3-6.8 for soil...a lil below or above that range and you might still be okay depending on how picky the strain is. If you water or feed with a ph of 8.5 it will not take long for you to have problems IMO. I stay at 6.5 during veg and let it creep towards the high end of 6.8 during flower. Just look at a nutrient chart and you will see that at 8.5 you are locked out.