Tetra BF Bio Foam for EX 600 EX 700 EX 800

Tetra BF Bio Foam pads are replacement filter media parts for Tetra/Tetratec external canister filters. They provide efficient mechanical and biological filtration, removing medium sized particles from the water and have a high surface area to support growth of beneficial bacteria. These should be replaced when they lose their shape. Contains 2 foam pads.