Feature:1. SUPERIOR PERFORMANCE: Aquarium sponge filter catches larger waste particles and mechanically cleans the water without trapping fish.2. MULTIPURPOSE: Aquarium biochemical sponge filter can be used as a culture filter or as a secondary filter.3. IDEAL METHOD: Aquarium biochemical sponge filter is a great way to clean fish tanks and cultivate useful bacteria that are beneficial to fish.4. EASY TO USE: Aquarium biochemical sponge filter is used as a pre filter unit by installing an external or top filter.5. SAFE MATERIAL: Aquarium bio sponge filters are made of high quality cotton and plastic, are safe, non toxic and odourless and can be used for a long time.Specification:Item Type: Aquarium Bio Sponge FilterMaterial: Cotton, Pastic.Package List:1 x Aquarium Bio Sponge Filter