I have an APS 1000+UV and I cant hear it over the air pump blowing bubbles in my daughters tank, but it is inside the cupboard of the tank stand. But even with the door open, I have to put my ear down to the filter to actually hear anything. Im very happy with it so far. And thier customer service is great, even replying to an email I had sent over the weekend, when I didnt expect a reply till the following week. I would say why not give them a shot, lots of people on here recommend them. for the price its worth it.