The filter sponge absorbs dirt and clears the water. Fully submersible and ideal for any aquarium filtration. 3 Stage filtration. Max 1200 l/h. 20 Watt powerful motor. Pure copper motor. Single cartridge. More silent and powerful. Better aeration. Full adjust ability. Crystal clear water. Filtration is the heart of an aquarium fish needs to be crystal clear water to stay in an aquarium healthy, filtration can be biological, mechanical and chemical. The filter sponge absorbs dirt and clears the water. Fully submersible and ideal for any aquarium filtration. Suitable for both fresh and salt water.