The ring is to keep the food in one place. That way, if there is food left after a couple of minutes, I can skim it out and keep it from contaminating the pond. I'm still working on it, though. The 3/4" pipe isn't wide enough, and the fish wash the food out of the ring when they attack it. I'm going to try 2", or 3" pipe and see if that works better. I'll probably do a bigger ring, too.