In response to Linda Kelley: Unfortanally you may have what we call a water saver toilet, it doesn’t allow as much water to flush toilet. What you need is a closet auger, can be purchased at most hardware stores. It is a hand held snake, which is very simple to use, but be careful not to scratch the toilet. The septic system has nothig to do with this problem, it is most likely, just that you probably have a water saver toilet.