Penn-Plax Cascade 300 Filter Replacement Bio-Sponge (1 Sponge) – Provides Filtration for Freshwater and Saltwater Aquariums

REPLACEMENT FILTER MEDIA: This Bio-Sponge is specifically designed for the Cascade 300 Fully Submersible Internal Filter (CIF1), and serves as a replacement for when it’s time to cycle out filter media. FILTRATION: This replacement Bio-Sponge provides excellent filtration for the CIF1 Internal Filter from Penn Plax. 1-PACK: The package only contains a single Bio-Sponge. Although they are disposable, they can be reused time and time again. REUSABLE: Simply clean the Bio-Sponge in a separate container with some of your aquarium’s water. MEASUREMENTS: 2” (L) x 1.75” (D) x 1.75” (H)