I recently went on a vacation, about 1.5 months. After i came back the pool was fine chlorine-wise. But my pump is making a loud noise when it turns on. It is loud and annoying. I just hope my neighbors don't complain!! I did not run the pump yesterday. But i had to turn it on today. And its loud. Can you please let me know what could be the problem?? I have an A.O Smith 2HP pump. I googled a bit and found fixes from changing the pump to changing the motor to fixing the capacitor. My pressure has dropped from about 9 to 5psi as well. Not sure if that is a major concern.