My wife and I are slowly settling into our new home (not brand new, but new to us) and it's the first time we've ever been on a septic system. I've heard there are some do's and dont's associated with it and I'd appreciate some preventive maintenance tips that anyone has to head off a septic tank nightmare like a backup or something like that. How does a septic system work anyway? Also, what about those septic additives that they sell at the grocery store...should I buy those? I was also told that a package of yeast once a month down the drain will work as well. So what should I do?