Fluval Foam Filter Blocks for FX Series - 3 pk Sausage Design features Dual Reinforced stitching

Design features Dual Reinforced stitching at every seam for durability and a leash-slit along the backside

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Fluval Foam Filter Blocks for FX Series - 3 pk Sausage Design features Dual Reinforced stitchingFluval Foam Filter Blocks are designed for use with Fluval FX Series Filter models, including the FX4, FX5, and FX6. The custom fit blocks feature a snug fit to prevent bypass for more complete filtration. The foam filters have a pore size that allows efficient water flow with less clogging for improved performance and a longer life. The foam inserts also enhance biological filtration by providing an ideal medium for the growth of beneficial bacteria,