Aquarium Filter Reuse Wash Filter Magical Blanket Bag Pad Biochemical Biological Filtration Clean for Fish Tank Bottom Filter Features: Biochemical Blanket or Bag filter provides biological filtration to the aquarium, helps to stable water quality. Increase the oxygen solubility. Working noiselessly, very durable, can be used for years. Good permeability, easy to clean. Perfect filters accessories for your tank and aquarium. Speicificaitons: Product name: Aquarium Blanket/BagFilter Color: WhiteShow as picture Size: Blanket: 20x30cm, 30x40cm, 40x50cmbottom filtration, 12x100cmup filtration Bag: 11x24cm, 19x34cm, 19x45cm fix it on the water outlet Reminder: 1. Soak the blanket or bag in the boiling waterfor 5 minutes before use, by doing this will help nitrifying bateria colonise easier. 2. Use tap waterto rinse clean the blanket with fluff down ; clean the bag by fixing it on the water tap. 3. Place the blanket in the wet and dry separation box with fluff up . Notes: Please allow 1-3cm differs due to manual measurement. Due to the different display and different light, the picture maybe a little different with theactual color of the item. Thanks for your understanding. Including: 1pcs /2Pcs Aquarium Blanket/Bag Filter