The filter sponge absorbs dirt & clears the water. Fully submersible and ideal for any aquarium filtration. 2000 L/H. 30 Watt Very Powerful Motor. Pure Copper Motor. Single Cartridge. More Silent and Powerful. Better Aeration. Full Adjust Ability. Crystal Clear Water. Completely under water. Keeps your water clean. Long-term provides filtration. Venus Aqua 3003F is suitable for fresh and saltwater aquariums.