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