i live in texas where we have 18 inches of sand over clay. my double tank old style dribble thru anaerobic septic system was putting out some pretty nasty stuff into and old shallow well about 700 feet downhill from my leach lines. it looked like bordens chocalotte mik with froth on top and stunk reeeeeeeeeaal bad. I got 2 devilbiss nebulizers machine (air pumps) that our govt sponsored wlefare system gives to every poor child with a snotty nose. found one at a steel salvage yard paid 10 cents a pound and got the other off of the interenet used. hooked nylon tubing up to them and made a tube to go down in my septic tanks with some pvc pipe. i have been running them for several months and the water in that old well is clear and doesnt smell and there are frogs living in there as well. you can turn your septic tank into an aerrobic system the same way. i will probably put a time on them and run them only 12 hours a day after a while. bh