I got the filter media in today, so I set up my Rena Filstar XP2, and as far as I can tell, it's not doing anything. I've stopped and started it half a dozen times, there are no leaks, I've cleaned and checked and rechecked the impeller and I'm about ready to pound my head against the wall to see if that helps. At one point, I did discover I had the hoses hooked up backwards, but after that I can't find anything that I may have hooked up wrong or that is loose/tight/whatever.... ARRGH!! It sits there and makes noise, but no water is moving out of the spray bar. :x I guess everything is pointing to the impeller, but other than cleaning it, how do you fix an impeller?