Argh. The filter is due for a cleaning next week. I'll play with it some more then. If not, maybe getting a replacement part is in order.
My apologies for the thread hijack.
:topic:
Hey, no problem...my filter is noisier than I would like, too, but only became so after sucking up some sand and then I had to take it apart and re-start it! So I appreciate the advice on repositioning the impeller. I think I maybe pushed it too far down into the pump.