Features: 1. Connected with the air pump, can produce a lot of bubbles and improve water oxygen level, providing much oxygen with fish but keeping water clean. 2. Ultra-slient filter, won't disturb your sleep, work, and other's life during the night. 3. Can absorb dirt, quickly resolve fish feces and eliminate smell in water 4. Easy to use, suits for both fish tank and aquarium. 5. Premium quality materials made, durable to use. Specifications: Materials: Enviromentally friendly sponge, Plastic Size: 19.5x13.5cm
