"Koi-Lo" Inane messages in my name by Hipcrime. wrote in
:

I heard they've been improved in the last few years. Actually my
Fluval 103 was pretty quiet all things considered. I find the worst
offenders where noise is concerned are airpumps. GEEZE! Even the
so-called quiet ones can be heard if the house is quiet enough at
night.

We've brought some of the newer models into the store to test recently,
including the fancy FX5. We weren't impressed... they're still using the
same old parts that tend to break that caused us to stop carrying them in
the first place.

The two canister brands I trust are Eheim (biological) and Rena XP
(mechanical). Tetra makes some good pond canisters too.