Originally Posted by PhatRam32
It is like a humming sound but a little bit louder than what the Whisper was making. The tank is 15 gallon. I do not have sand I have gravel. I don't think it is that strong to suck that up.
Ah alright. Wanted to ask other variables to get them out of the way. I have had different size Aquaclears in the past. They always have a gentle hum to their motor when they are working properly, and when the motor isn't a bad one.
However a louder than average noise that starts to increase is a cause for concern. It doesn't sound like you have anything in the tank that can get into that motor and it shouldn't be irritatingly noisy at start up. So if the noise seems to be unusual, or increasing:
What I can suggest is to first check how the unit is sitting. Check that it is sitting evenly and hugging the tank properly. Check the seal of the intake tube over the area where it goes into the unit. If it is off kilter slightly you can end up with an unusual noise from your unit.
The other thing you can do is pull the motor off and look at the unit itself. Check the impeller by pulling it out. Is it in good order? Your impeller shouldn't be cracked, and the wheel thing with slats should all be intact. If it is not take the unit back. It shouldn't be defective right out of the box.