DescriptionThis aquarium filter cotton is made of premium material for durable and practical to use. It can be used in seawater tank, fresh water tank, aqua-plant tank. And its strong filter ability and high density design can stable water quality and reduce fish died.Features-Material: 8D fiber cotton. -Made of high grade material, it doesnt interfere with your fish tank's other accessories. -It comes with fine material and highly efficient filtration of impurities in water. -Purify your fish tank with this high density filter pad, a nice helper for you. -The filter pad has plenty of surface area to create superior biological filtration. -High water penetration efficiency and no water accumulation, convenient to use.