Aqua Pro Bioscape Tropic Canister Filter 1800/2200 with Blue Bio Foam - 2 Pack for Aquariums & Fish Tanks - Perfect for Freshwater & Saltwater Aquatic Environments

Pro Bio Foam improves the filtration power of your Aqua Pro and Bioscape Tropic External Filter and will prevent debris from clogging other media in your filter. The porosity of the foam also provides area for biological activity, allowing this foam to perform as both mechanical and biological filtration media. For fresh and marine environments.