• 2-step filtration: The aquarium internal filter contains 2 filter sponges of different densities that can absorb impurities and suspended particles to keep the water clear. • Transparent filter cartridge: Made of ABS material, it allows you to clearly see the cleanliness of the sponge. • Oxygen supply: Oxygen is directed down to the depths of the aquarium with a new pointed nozzle, increasing the oxygen content more than the traditional form. • Easy to clean: The aquarium pump with filter has a simple structure, easy to disassemble and assemble. The filter sponge can be reused after rinsing. • Suitable for aquariums of 30 l ~ 80 l.