With an airlift system, super bio-mechanical sponge filter features silent operation, and has an excellent filtering effect while oxygenating the water. The specially developed foam materials support the colonization of bacteria, allowing for mechanical and biological filtration, which will break down harmful ammonia and nitrite
![Aquatop Classic Aqua Flow Sponge Filter 40 gal Aquatop Classic Aqua Flow Sponge Filter 40 gal](https://cdn11.bigcommerce.com/s-ldfio/images/stencil/500x659/products/2475/184808/original__42318.1721073919.jpg?c=2)