Yep, thats exactly the conclusion that I came to
I was following everyone's info. to the T, and gosh darnit nothing was working. I figured maybe I had algae or root rot or something, so completely broke down my system, washed with mild bleach, rinsed and scrubbed and rinsed and scrubbed and used some H2O2 and the roots were bright white and everything seemed just fabulous in the res. and water system.

But that darn PH just kept falling. I was using GH PH Up 4 or 5 times a day, it was crazy! Then I read BigTokes thread on ICMAG and like a miracle the baking soda worked for me the very first time and has been very stable ever since. I have to assume that my water through my ro filter just comes out with almost no ph buffering capability at all. And with GH 3 part nutrients, just not enough built-in buffering.

After this harvest I'm going to just fill some containers with tap water and ro water and see what the PH does over time in them. Sometimes there's just no substitute to gathering your own data imp:
MisterE Reviewed by MisterE on . Supplements for flowering? I am at day 20 of flowering and was going to pick up a few needed things and was wondering if I should be picking up some extra supplements to increase or make a healthier yield? I currently am only using RO water, GH 3 part, and calmag+. I'm not looking to do anything experimental or difficult. Just wondering if there's any "must have" or "highly recommended" flowering supplements? Rating: 5