... facotry (3) pass SGS,ROHS test Aquarium filter:Filter sponges are widely used for aquarium filter,air filter and other filtering ... , medical, Architecture, household electrical appliances, aquarium, autos and motors, sewage and petroleum treatment for filtering, protecting, decorating, straining, cleaning and ... Excellent absorption. (4) Purifying ability.(5) Eco-friendly product. Aquarium filter