pH Keeps rising..

Hello all, I have had some recent issues with my pH here. I am using a bubbleponics unit, with store bought filtered (reverse osmosis) and carbon filtered...So there are NO contaminants that should be affecting my pH or plants. ppm is usually around 30 right out of the keg, and pH is a solid 7.

I am using the flora series 3 part(micro/gro/bloom) and I am using the micro-hardwater, because originally was using tap, and that started to kill them so I switched. I don't think this is the problem however, as all flora series components are pH buffered.

ALSO - I currently am running the bubbleponics unit on JUST water.. I flushed two days ago and the pH problems persist.

WTF? I pH it down to 5.0 and a few hours later it is back up to 6.0-6.3... so again, wtf..

this is a true enigma for me... if anyone has any suggestions please feel free to leave em up! thanks all- TGH

You just have to make a schedule that contain hours that you have to ph down and put in there how many ml you have to put the ph correct again. And thats it the easy way!