This aquarium filter pad is made of cotton material for durable and practical to use. It can be used in seawater tank, fresh water tank, aqua-plant aquarium . And its strong filter ability and high density design can stable water and reduce fish died. Effectively avoid , reduce fish mortality and chemical filtration, increase oxygen solubility in aquariums and fish tanks. Features -Color:White -Material:Cotton -Size:50.00X30.00X2.00cm/19.65X11.79X0.79in - High density design, not easy to damage. The material of the filter sponge will not be crushed to achieve the filtering effect and smooth water. - Suitable for sea water tank, fresh water tank, water tank, fish tank, tank bottom tank or drip filter aquarium. Regular cleaning, after cleaning can be reused. - You can easily cut this cotton pad as needed. Choose the right size for your filtration system. Give you more convenience to filter. - It's easy to clean. Effectively avoid , reduce fish mortality and chemical filtration, increase oxygen solubility in aquariums and fish tanks. - Use this filter cotton in the fish tank to get the and bring a clean environment to your fish. You can use it with confidence. Package list: 1 x filter cotton pad