Penn-Plax presents the Cascade 300 Filter Replacement Bio-Sponge.
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.
The Bio-Sponge is specifically designed to fit the Cascade Internal Filter model CIF1 by Penn Plax.
1-Pack: The package contains a single Bio-Sponge. Although they are disposable, they can be reused time and time again. Simply clean the sponge in a separate container with some of your aquarium's water.
Measurements: 2” (L) x 1. 75” (D) x 1. 75” (H).