- The sponge filter provides biological filtration, and the air pump chamber produces fine bubbles that increase oxygen solubility. - Creates crystal clear water, ideal for small aquariums. - Convenient and easy maintenance. - Applicable to different filtration systems as a pre-filter. - Uses high-quality eco-friendly sponge as a filter, and uses an air pump. - To ensure effective cultivation of nitrifying bacteria, to achieve stable clean and good water quality, and effective oxygen filtration and water quality.