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