A grinding noise means your pool pump motor is failing.

Probably. Motors don’t hide their problems well. If you hear screeching, grinding, or a high-pitched whine, bearings are shot. If it hums but doesn’t spin, the start capacitor or the motor itself is dead. If it trips the breaker immediately, that’s a short or a locked rotor.

Don’t ignore a leaking shaft seal, either. Water gets into the windings and fries the motor from the inside out. That one usually starts as a slow drip near the front of the motor, then one day it won’t start.

Replace it before the motor seizes completely. A seized motor can damage the pump housing or impeller, turning a $200 motor swap into a $400 pump replacement. You can hear trouble long before you see it.