Fluval Foams capture large particles and debris for effective mechanical filtration the crucial first stage in the filtration process. Custom fit to prevent bypass they have a pore size that allows efficient water flow with less clogging for long-lasting filtration. These inserts also enhance biological filtration.

• 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