Im puzzled too weedhound - but I did just increase nute strength to 1250 ppm from 1000 ppm (in 4th week flowering) and my pH is dropping from 5.8 to 5.4 during the course of the day....I'm somewhat baffled. Plants look fine so I don't think it's too strong....guess I'll just keep an eye on it.

:jointsmile:
doco Reviewed by doco on . Nutrient Strength pH Balance Relationship? I just saw this on another site and since I hadn't heard this before, wanted to run it by some of you - whatcha think? "There are a couple factors that cause your PH to drift. The most common is running the nute solution too strong or too weak. If it's too strong, your PH drops. If it's too weak the PH rises. You have to find the balance point." Rating: 5