DENNERLE pre-filter refill accessory, large for filter 5617

The large Dennerle pre-filter cartridge is designed for the BioCirculator 4in1 aquarium filter. It provides mechanical water filtration, trapping coarse debris such as plant or food residue. This process protects the main filter media from clogging up too quickly and helps maintain stable water quality in the aquarium. This replacement cartridge is fully compatible with filter model type 5617.