Neptunes Apex PMUP loud/screeching sound?

[Joeganja]

I use this pump for my ato and it sounds like a pump that's on when it's out of water when this pump is in water. It sounds like it struggles. This is the version with the power source being a socket not the 1link. Anyone else have issues or should I contact neptunes?

 

[jonmos75]

I would open a support ticket with Neptune

https://www.neptunesystems.com/support/contact-support/