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For an even higher filter capacity, can be used as an alternative to the filter element with 3 layers of fleece. Especially recommended where fish are present. In the corner filter XL you get multi stage filtration by switching to just one filter element.
Simply fill, rinse (due to possible residue caused by abrasion in transport) and insert in the place of the filter element.
For filling with Nano filter medium (Biofilter Granules/Algae Stop/Active Carbon).