Had a somewhat spongy backyard and was pumping the septic 3 times per year. Was told by the pumper (who's brother has a Septic installation business) that the system was "beyond recovery" and needed a new field to the tune of "Oh, around $18,000".
Don't remember how I found out about AeroStream but figured anything was worth a try. Installed the unit in late March 09. No more pumping, no more spongy backyard, no more worries. A friend of ours, at our recommendation, installed a unit in his "failed" septic system. He's also singing it's praises.