Bio Sponge Filter – Single The sponge is designed with multi-layer and the material is easy to clean. The air diffusion chamber produces a lot of minute air bubbles. This increases the oxygen solubility in the water. Quiet operation, suitable for angel fish and other small fishes. Note: Soak the sponge in the aquarium water for 5 minutes before use. This helps nitrifying bacteria to colonize easier. Always use aquarium water to clean the sponge, never use hot water.
