Thanks for advice. You know, I don't remember ever monkeying with that jet, and the three jet cluster has been working until recently. Now, only the top two work and their flow seems pretty strong. I tried turning the bezel, but it moves only about 1/2 inch each way. I'll try to keep working it. If that's not the problem, what else could be blocking flow to the third jet. As further information, I pulled the filters and also the filter towers. The suction at the holes under the towers is good on one, a little worse on the second, and almost non-existent on the third.