I was so hopeful when I ordered three of these filters. To say I'm disappointed is an understatement. Two started being noisy...in just under a month of use. This is why I don't hold out hope for the third. I've had many filters over 50 years so I know how to check for and solve most issues. Nothing worked. And the water level is fine so that's not the problem and that's not the noise. If these were in tanks across the room it would be semi tolerable. But they are right next to where I sit on the sofa. On the plus side and just enough to change stars from one to two, they are easy filters to set up and seem to work well. So if yours remain quiet I am sure you will be satisfied.