Sponge filter is an easier way and effective way to keep your aquarium tank clear and healthy. Without air stone required is another advantage of this sponge filter. It is best to use for those breeding tank and also can act as a pre-filtration for most of the filter such as top filter, liquid filter or external filter. With that, sponge filter will filter the naked eye can see dirt at first meanwhile prolong the time to clean the secondary filter. It does allow for mechanical filtration and biological filtration while oxygenating the water.