only $5.99 Fluval 204/304 Foam Block 2pk 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. Instructions: Rinse foam monthly or as needed to retain biological activity. However remember to rinse foam in aged aquarium water so very little biological bacteria is lost. Also when replacing the foam replace the cartridges alternately so that the biological activity will remain in place. Specifications: Contains two foam pads. Size: 8 1/2 " x 2 3/4 " x 1 "
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