COCOMELON Aquarium Filter Sponge Sheet for Fish Tanks Suitable for All Top Aquarium Filter, Best Accessories in Its Class White (Set of 6) Sponge Aquarium Filter  (Biological Filtration for Fresh Water)

The sponge sheet filter pad's durable polyester cloth can be gently washed and reused many times before needing to be replaced, making it a cheaper alternative to disposable filter media. INDIYANO aquarium filter sponge is easy to cut into whatever shape is needed to fit your aquarium filter. It will work in most traditional hang-on back filters, canisters, and sumps.