Burgermeister,
Many septic related products are actually enzyme mixes which can be effective depending on what one's goals are (i.e. reducing the solids in the tank at the risk of sending them out into the drainfield). The bacterial products aren't harmfull but have never, to my knowledge, been scientifically shown to be effective.
I fully agree that aerobic bacteria are much more energetic at digesting organic matter. However, being a born skeptic, I'm not sure aerating the water in the bottom will translate into having aerobic conditions and an aerobic bacteria population in the bottom goo. Going one step further, if you can establish aerobic conditions in the muck, the aerobic microflora and microfauna will follow on their own.
Having never used these products I would like to hear about the success stories.
