First, clean water is dependent on a number of things - size of animal in the tank, how often the tank is maintained, how much and what you feed, etc. Filters just help reduce our maintenance, but are not completely responsible for tank care.
In regards to the noise, it should be quiet. If it is not, make sure the water is being pulled in. The slots along the bottom couple of inches of the filter housing could be clogged so water is not coming in faster than it is being pushed out. Also, open the pump and check the impeller to make sure this has not become clogged with algae, sludge, etc.
I will email instructions to you on how to clean the pump, in case you need them.
Date published: 2017-04-11