Filtration material made from sterilized, non-toxic white wool for mechanical filtration. It removes suspended particles and larger pieces of debris.

• Diameter of balls: 4-5 centimeters
• Suitable for the pre-filtering section of biological filters, overflow sumps, or external filters
• Provides flexibility in shape and adaptability for use until the available space in the filter is filled

Tags: aquarium mechanical filtration, aquarium cotton