Originally Posted by Lisa Hunter
My Penguin Bio wheel 330 is making a lot of noise.
These units do have some parts (impeller, impeller housing, wheel bearings, wheel, etc.) that can wear out.
Here is a link to a parts diagram.
Penguin 330 Parts | Pet Solutions
They also seem to splash more if they are not level.
Can you tell us what type of sound you are hearing? (splashing, grinding, squealing, etc.) Also can you tell if it's coming from the pump impeller or the bio-wheel? The age of the filter and how long it's been running may also help.