Both my 15 yr old Emperer 400 and Hot Magnum 250 started getting noisy at the same time so I bought new parts for both of them but was surprised the 400 was still rattling. The Magnum with the new impeller,gaskets,air ejector tube and D ring still had water sloshing around inside and I discovered it was leaking out the bottom. So I tried a new AquaClear 110 and it had a really noisy motor! The new Emperer rattled too which was extremely disappointing since it's a fantastic filter. Then I bought a new Magnum 250 and it leaked out of the outlet tube where the factory put it together. I'm shocked at how the quality of all these fantastic filters has gone right down the tubes (pun intended). I took all of them back so the manufacturers know we're not going to stand for cheap quality! Are there any other filters any of you are using that are extremely quiet and do not rattle? I have a 75 gallon and need some filters urgently. I have a very small house so you can hear a noisy filter.