Also, try placing heavier things on the lids. I keep plants on mineTake the lid off. I do that with my ac50 at night in my room. It makes it 5x quieter.
This is what I do. And take the top off as previously suggested, the top always vibrates and makes it noisier.Make sure the impeller is in properly, I have also used pure petroleum jelly to lubricate the impeller as well![]()

Also, when I took the filter out of the box to initially set it up, I noticed that the impeller wasn't seated in the pump. It was just sitting inside of the filter, I had to put it into the pump myself, but when I inspected the impeller, it looked fine.


