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Fluval 206/207 306/307 Foam Insert
These replacement foam inserts are perfect for keeping your Fluval 204 or 304 running smoothly and your fishy friends happy.
Fluval Foam provides mechanical straining of particulate waste. It prevents particulate waste from prematurely clogging other filter media in the module stack. Although the primary purpose of Fluval Foam is mechanical filtration, biological activity will eventually occur within its pore structure.