50Pcs 35mm Aquarium Fish Tank Pond Biological Sponge Cotton Bio Ball Brick Filter Media

Specification: Material: Plastic + Spongia Color: Black Width: 3.5cm/1.38''(appr.) Features: 1. Can be reused over and over again until it breaks. 2. Great for fresh or saltwater aquarium filtration systems. 3. Each filter media is pre-packed in its own mesh media bag. 4. The bio balls provide biological filtration, removing toxic ammonia and nitrite. 5. Media bags allow the precise placement of media and ensure granular media doesn't travel through pumps and pipes. Package Included: 50 Pcs Filter Cotton