Yeah, you are right about the roots, I was thinking about that, but I was thinking SMALL bushes with small roots. Maybe a big flower pot could be used, maybe partially underground. You are definitely right about pumping out every three years, maybe more often if you have a large family. It is a lot cheaper than putting in a new system b/c your old one gets ruined. Keep track of where your (two?) pump-out/inspection covers are. I know the company I use charges less if they don't have to search for them. I write down the measurements (triangulated) to them off the corners of my house.