Thanks WH, this stuff just accumulates in my brain.

If the maker of something says it's OK with H2O2, coolio. However, you can do your own compatibility test in a teacup. A little water, some of the material you want to test and some H2O2. If the mix foams or bubbles when you add H2O2, chances are there's organic materials in the material you're testing and H2O2 is breaking them down.
Al B. Fuct Reviewed by Al B. Fuct 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