Hagen Fluval 104 / 105 Foam Filter Block 2pk

Hagen Fluval 104/105 Foam Filter Blocks 2 pieces per display pack Hagen 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 Hagen Fluval Foam is mechanical filtration, biological activity will eventually occur within its pore structure.