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Eheim 2008 Internal Filter Pick Up 60 Cartridge.
The function of the foam is to trap solid waste without which your aquarium would never be clear and the second, even more important function, is acting as a home for nitrifying filtration bacteria which process the toxic Ammonia your fish produce as a dissolved waste product.
Clean the sponge in aquarium water between changes and replace every 8 weeks.
Use with carbon sponge 2627080 for crystal clear water.