Designed to polish aquarium water in the last stage of filtration, Eheim Fine Filter Pads for 2215 can help polish coarse and fine particles before the water is returned to the environment. They’re manufactured with a very fine, porous material that effectively traps even the most minute particulates to ensure the finest level of biological pollutant removal. Still, these pads encourage great colonization conditions for positive bacterial cultures, including the bacteria that helps decompose harmful substances. These reusable Eheim Fine Filter Pads can be reused several times but must be replaced once they become soiled to avoid damage to the filter’s motor head. To clean the pads, simply rinse them and squeeze out any excess water. Eheim offers the 2215 Fine Filter Pads in an economical pack of three.