Rick, I actually do mess around with the first part of the pro mix that I add to the potting soil and then I just add more promix. Does hydrogen peroxide help anaerobic soil. Once I was using a large plastic container to wet my potting soil in. I didn't use it right away and, for convenience drained water from another source into it. After a few days, the odor told me it was anaerobic. It was quite a bit of potting soil, so I decided to hit it with some H2O2. A day later the soil smelled very fresh again. Is this soil now usable??