Features:

Biochemical sponge filter provides biological filtration to the aquarium, helps to stable water quality.

Increase the oxygen solubility.

Working noiselessly.

Good permeability, easy to clean.

Perfect filters accessories for your tank and aquarium.

Speicificaitons:

Product name: Replace Cotton for Aquarium Sponge Filter/Aquarium Sponge Filter

Color: Black (Show as picture)

Model Number: XY-2831, XY-2830, filter sponge
Sponge Size: 48mmx80mm

Reminder:

1. Soak the sponge in the aquarium water for 5 minutes before use, by doing this will help nitrifying bateria colonise easier.

2. Always use aquarium water under room temperature to rinse clean the sponge, never use hot water.
3. It must be used through connecting the air pump.

Including:
Aquarium Filter XY-2831, XY-2830, or 1pcs Filter Sponge