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XY-2830 Size: D 2" H 3" Single Sponge Filter XY-2831 Size: D 2" H 3" x 2 pieces Dual Sponge Filter Benefits of having a sponge filter in your aquarium - Supplies the water with aeration and filtration - Easy maintenance - Can place multiple sponge filters in one aquarium - Just needs an ordinary airpump for it to function. - Acts as a biological media that beneficial bacteria can grow on