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Give it purpose - fill it with water filters, air filters, refrigerator filters, and more.
The Fluval A457 fits the following filters:
The Fluval Nano Fine Foam Replacement 2-Pack - A457 includes two pieces of aquarium Bio-Foam that fits the Fluval Nano Aquarium Filter and helps capture fine debris. The Fluval Nano Fine Foam provides less clogging with its pore size and promotes the efficient flow of water.
Fluval Nano Fine Foam Replacement 2-Pack - A457 specifications: