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Matrix™ is a high porosity biomedia that provides efficient biofiltration for the removal of nitrogenous waste. Every Tidal™ filter comes with a bag of Matrix™ to get you started.
Matrix™ for the 35, 55, 75, and 110 units comes pre-bagged in Seachem Zip Bags, which feature durable seams & a corrosion-proof zipper.