• Safe and healthy environment

These Bio-Sponges are specifically designed for the Cascade 170 Fully Submersible Internal Filter, and serve as a for when it's time to cycle out filter media. The Bio-Sponges aid with keeping the water inside your tank crystal clean, allowing for a safe and healthy environment.

Features:

• Bio-Sponges optimize the colonization of anaerobic bacteria, along with providing mechanical filtration that traps large particulate matter - Keeps your aquarium cleaner, longer