【Biochemical Filtration】 With air pump as the power source, combined with mechanical filtration, the principle of biological filtration utilizes multi-level filtration to culture beneficial nitrifying bacteria, and the sponge can absorb fine particles to achieve the effect of purifying water. The water flow is controlled by the airflow, which is small and slow and does not impact the fish
【Suitable Size】 The small sponge filter is 6 inch width and 9 inch to 13 inch height, the sponge inside circle diameter is 0.39 inch, suggest for 10 to 40 gallon fish tank. Suitable for shrimp tanks, betta fish tanks, breeding ponds, turtle tanks, goldfish, discus, crayfish, deep-fried fish, juvenile fish or other fish.
【Changeable filter material】 Two kinds of replaceable filter materials: sponge + filter box. You can easily remove 2 sponges from the filter for cleaning or replacement, with a total of 4 sponges. It also has a media container with a ceramic filter inside to help eliminate harmful substances and provide additional cleaning power. Other filters can be replaced.