Also been running the GH for awhile, in my dwc I adjust to 5.6 when changing rez and don't adjust at all after that, it's at 6.4 usually when I change my nutes out. Most of that raise is prob from top offs, seeing as my tap is right around 7.2! The drift in pH I believe helps the plant to take up the full spectrum of nutrients available to it.

@5.6 your getting the Calcium and Manganese.

@5.9 and above your Phosphorus and Magnesium

Everything else is available in between, you need all of it.
socialistpete Reviewed by socialistpete on . yet another PH post So I visit this site pretty much everyday reading this and reading that, trying to absorb as much info as possible. So I was looking at the FAQ section of cannabis.com (not the one on the message board area) and to my surprize I read that the optimum PH for Hydro is 5.2 and not 6.0, actually the PH range stated best to be in is like 5.1 to 5.9. anyone want to jump on board the discussion train about this? also states that you can lower your ppm by using this range since plants can more easily Rating: 5