only $7.99 Fluval 404 Foam Block 2pk - Fluval Foam provides mechanical straining of particulate waste from prematurely clogging other filter media in the Module Stack of the Fluval 404. Although the primary purpose of Fluval Foam is mechanical filtration, biological activity will eventually occur within its pore structure. Instructions: Rinse foam monthly or as needed to retain biological activity. Rinse in aged aquarium water. Fluval Foam will deteriorate over time and will need to be replaced. Size: 11.5" l x 3" w x 1" h each
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