LTWHOME Compatible Blue Internal Filter Foam Replacement for All Pond Solutions 600IF (Pack of 6) They are just Activated Carbon

They are just Activated Carbon impregnated foam

Provide both mechanical and biological filtration

The cleaning sponge with high density

Package include: 18 Fine Green Foam Filters and 18 Blue Coarse Foam filters

Custom designed and manufactured for the Eheim 2012 Pickup filtration systems

LTWHOME Compatible Blue Internal Filter Foam Replacement for All Pond Solutions 600IF (Pack of 6) They are just Activated CarbonPack include: 6pcs. Custom designed and manufactured for All Pond Solutions IF Internal Aquarium Filter, Fits All Pond Solutions 600IF. Trap large particles and debris keeping your aquarium clean and clear. Good for freshwater & marine environments. Ensure efficient water flow with less clogging for long lasting filtration. Provide both mechanical and biological filtration to extend the life of your filters.