Dennerle Nano Filter Modul: Filter cup for Nano Corner filter and Nano Corner filter XL.For even higher performance of the filter in the aquarium. Alternatively, use instead of the filter element with filter fleece. Especially recommended for aquariums with fishes. With this filter modul in combination with the Nano Corner filter XL you will get a multi-layer filtering system. Simply fill rinse, (due to possible transport-related abrasion) and use instead of the filter element into the filter.Do you have questions about this article ?