I removed the powerhead from the housing because it wasn't peeing from the pee hole and was getting very hot and I tried all the recommended cures too no avail ie: new water pump, back flush through the pee hole and a garden hose into the copper tube. I found that the grommet at the end of the copper tube was obstructing the flow.While I have this disassembled is there anything else I should look at? Thank you