IM-018 Air Filter This compact, fashionable and beautiful air filter is the superior partner of the air pump, and can imitate the natural filtration system. The high-efficiency activated carbon in the filter box effectively purifies the water quality and makes the water quality clearer. The high-density filter cotton can absorb residual impurities in the aquarium, such as fish erbium, while the high-efficiency biochemical sponge can ensure the highest quality fresh water. The high-quality bubble stone can increase the solubility of oxygen in water to enhance the better effect of oxygenation, while the bottom of the filter stone can effectively block many molecules in the water to ensure pure water quality. Suitable for fish tank