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• Stock up with the (3 Pack) Fluval Filter Foam Blocks for 104/105 canisters—6 total blocks (2 per pack) for superior mechanical filtration! Each dense, porous sponge traps large debris, fish waste, and particles to keep water crystal-clear and protect downstream carbon/BioMax stages. Custom-cut for perfect fit in Fluval 104/105/106/107 models; rinse monthly for reuse, replace every 3-6 months.