Sicce “Space Eko” Replacement Sponge Kit – A set of original replacement filter sponges for the Sicce Space Eko aquarium filter series. These foam inserts are custom-cut to fit the Space Eko filters and serve to trap debris and provide surface area for beneficial bacteria. Replacing old or clogged sponges with this kit restores your filter’s efficiency in mechanical and biological filtration, ensuring clear water and a healthy environment for your aquarium’s fish and invertebrates.