Fluval Spec Aquarium Filter Foam Block 5.3" length x 2.2" width

Specifically designed for Fluval Spec Aquariums, the Fluval Spec Aquarium Filter Foam Block effectively removes large particles and debris from your aquarium for effective mechanical filtration. Although the primary purpose of Fluval Spec Aquarium Filter Foam Block is mechanical filtration, biological activity will eventually occur within its pore structure. Fluval Spec Aquarium Filter Foam Block is the perfect size to allow efficient water flow with less clogging.