are you using lime in the soil? or Sulfur? they can raise your ph if too much is used
What is the mix you use?
What is the mix you use?
Actually pop the problem is the opposite, pH is too high with roots for me. I always have this issue when I've run it and cannot figure out why. Ph always takes a drastic up after about 35days. Where I put in 4ph feed and Run off is 6.8-7., tried flushing 3x container size and doesn't seem to help. Thinking they are using too much lime or their ph buffer just wears out about that time. Very frustrating so that where I want to venture off to coco