Keep your aquarium clean and extend the life of your filter when you use the Pre-Filter Sponge by Fluval Edge. Specifically designed for the Fluval Edge power filter， this sponge helps to keep your tank cleaner by catching debris in the water before it even reaches the filter. It installs easily over the filter intake tube with minimal disruption to your aquarium， making it easier than ever to support your aquarium. By using this sponge， you can help to prolong the life of your filter and help prevent small or baby fish from being pulled into the filter system.