Replacement foam inserts for Fluval 404.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.....
Tags: fluval 404, biological activity, fluval 404 foam, Replacement foam inserts, pore structure, mechanical filtration, foam inserts
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