Thank you for the reply. I don't think it's sand in the impeller as I cleaned the impeller and shaft numerous times. The impeller chatters from time to time and feels a little loose. I think it's a design problem.
I have some Whisper power filters, but never had any problems with them. I had issues with impellers in some of my other filters, but that was because some my Malawian Mbuna were moving sand around and some grains got caught in the impeller shaft. I noticed that filter was making more noise, and impeller would stop from time to time. When I finally pulled it out, there was so much damage on it from sand grinding, that I have to replace them.
I also found out that replacing impeller cost almost as much as buying new filter.
So I say to her……There is plenty of stuff at the house for the baby to eat!!!! I REALLY need this fish……