FilterAir 30 Aquarium Sponge Filter for Fish Tanks by Aqua One 8.5cm x 19cm x 5cm

This is a FilterAir 30 Aquarium Sponge Filter for Fish Tanks by Aqua One 8.5cm x 19cm x 5cm. Aqua One sponge filters work by drawing aquarium water through the porous sponge. This provides mechanical filtration by trapping physical debris, and with its large porous surface area provides a home for beneficial, nitrifying bacteria, which break down biological waste into less toxic elements. Unlike Other sponge filters that don't offer chemical filtration. With the Aqua One Breeder Sponge range, the hollow centre allows carbon to be inserted to provide chemical filtration.