Are you checking your ph after you mix your nutes? because you should be they will effect it.
socialistpete Reviewed by socialistpete on . PH vs PPM Problem - HELP Getting my H2O down to 6.0 PH is raising my PPM by 325ppm !!! HELP PLEASE!!! I am using GH PH down. Can anyone recommend a PH down product that will not raise ppm so far. I am concerned about too much salts, too low nutes. THANKS Water (tap) 85ppm, 7.1 PH Temps are constant 70F H2O, 80F Air. GH 3 part nutes Hydroton grow medium (very well rinsed) I am running a 16 bucket DWC- 45 gal res -- 240 gal per min recirc. pump, 120 liter per min air pump (lots of bubbles), Water Farm drip Rating: 5