i opened my pool as I usually do and when I started the pump it was making more noise than usual. It seems to be pumping fine and the pressure is okay. I have not seen any evidence of any leaks from the pump.
Rather than the low hum it normally makes it sounds louder and makes almost a ringing sound as if someone was hitting a metal can in extremely rapid succession. I checked the opening where the impeller is that there was some debris in there so i cleaned it out as best as i could and that seemed to quiet it a bit. That said it is still making too much noise.
It is a Hayward Super Pump that is 4 years old.