Not be confused with it’s distand cousin, the mesh wheel impeller. The needle wheel impeller which Fauna Marin is not charging for comes standard in all blue line protein skimmers. With the image we aquired it looks to be a typical high quality Fauna Marine product. However, with this we again have questions. Why is the Mesh wheel impeller a cost upgrade versus the needle-wheel impeller? Is the needlewheel impeller not as efficeient as the mesh wheel? These questions in our humble opinion need to be answered.