..OK, but what exactly do you add to this "clean state"?? What nutrients (+ amount) do you add or whatever?? Because I encounter the same issues with the water. I have PH meter and I intend buying an EC meter as well as R/O system.
..By the way, I am talking about soil growth.
Could you also...
..Thanks, but what could cause this P or K diff?? I am asking because I am using pre-fertilised soil and the water PH is 6.5. Should I check the EC value of the water?