Aquarium Fish Poop Stool Toilet Manure Suction Filter Collector Fish Tank Biochemical Sponges With Media Balls Oxygen Increasing Biochemical sponge filter provides biological filtration to the aquarium, helps to stable water quality. Increase the oxygen solubility in water. Working noiselessly. Good permeability, easy to clean. Adhere smooth with cute suction cup. Perfect filters accessories for your tank and aquarium. Product name: Aquarium Sponge Filter Reminder: 1. Soak the sponge in the aquarium water for 5 minutes before use, by doing this help nitrifying bateria colonise easier. 2. Always use aquarium water under room temperature to rinse clean the sponge, never use hot water. 3. It must be used through connecting the air pump. Color: As Shown Material: ABS Package Contents: 1 * Quarium Sponge Filter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.