I have a reservoir which holds my nutrients until they need to be used. Recently I had added in a pump for circulation in addition to my air stone. Since then my solution has been rising to over 7 within a few hours. I adjust back down and it goes back up again? What the heck?
Have you changed your water? Build up of old salts from chemicals can contaminate it and will make ph unstable. Good luck and happy growing š²š²š²š
This literally happens in 3 hours. The plants do not touch this water untill it empties into the main reservoir, controller unit. So the plants have nothing to do with the problem.