Fluval Foam Filter Block, Replacement Filter Media for Fluval 404, 405, 406 and 407 Aquarium Filters, 2-Pack, A226

• Fluval Foam Filter Block provides effective mechanical filtration by trapping large particles and debris
• Biological activity will eventually occur in pore structure
• Filter media helps create crystal clear, sparkling aquarium water for healthier aquarium environment
• Replacement media for the Fluval 404, 405, 406 and 407 Aquarium Filters
• Includes two Fluval Foam Filter Blocks