The Sander Air Diffuser 2 is a wooden air diffuser made for use in marine aquariums. This two inch long wooden air diffuser is attached to an airline and air pump and placed in the aquarium, or more commonly a protein skimmer, where the wood creates a very fine mist of tiny bubbles. When used in a protein skimmer, these tiny bubbles allow protein to be removed from the water before it breaks down into ammonia.