Is there any good reason to test the Ph of your runoff in a soil grow? I know it's good to check when u flush to make sure it's the same coming out as it was going in. But what does the Ph of your runoff really tell you during a normal feeding or watering? I did a plain water last time, and just to kill my curiosity, I tested the runoff. The water I put in was 6.4, and my runoff was 5.5- does that indicate a problem or is it perfectly normal? I was guessing that my ruin off would have a higher Ph, but had nothing to base that on... It was simply a guess, and obviously a bad one. If anyone could take the time to explain this for me I would really appreciate it. I put it in advanced section because I figured you Guys would be the ones with most factual based answers.