Change your media in seconds with these ready-to-use cartridges. Just rinse and then drop them in. Cartridges provide a double thick polyfiber pad on one side to efficiently trap dirt and debris. The other side quickly removes dissolved pollutants by means of a patented ribbed backing that evenly distributes the super effective Black Diamond Carbon. Rite-Size D Cartridges are replacement cartidges for Marineland's Bio-wheel Canopies the 80 Gallon Euro BIO-Wheel Canopy Calypso Aquarium System.

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