Feature: 1. Safe to Use: The aquarium filter bag contains no harmful substances and is completely safe for fish, creating a high quality living environment for your pet fish. 2. Portable: The size of aquarium mesh media filter bags is 50x40cm, which is easy to carry and is an important part of keeping the water quality of the aquarium clean. 3. Improve Water Quality: Regular cleaning of filter bags can improve water quality and replenish nutrients in aquarium water by removing organic compounds before they continue to break down. 4. High Quality Material: The fish tank filter bag is made of high quality plain cloth material, which is soft, durable, and reusable. 5. Application: Fish tank thickening filter bag is ideal for capturing uneaten food, livestock excrement, rotting plants, debris, dust and other floating particles. Specification: Item Type: Fish Tank Filter Bag Material: Plain Cloth Size: Approx. 50 x 40cm/19.7 x 15.7in. Package List: 1 x Fish Tank Filter Bag Note: Please allow some errors due to manual measurement.