GERUI Fish Tank Filter, 4W-450L/H Silent Internal Aquarium Clean Water, Air Pump, Make Waves, Black+Blue

Bio-Filtration & Water Health： Features advanced bio-media to trap waste, and maintain crystal-clear water. Washable/reusable sponge promotes ecosystem balance for healthier fish and turtles. Adjustable Oxygen Boost： Integrated aeration system increases dissolved oxygen levels, energising aquatic life while supporting beneficial bacteria colonies. Easily control airflow via the external valve .  Library-Quiet Operation： Near-silent at 35dB (quieter than a whisper!). Pro tip: Close air valve at night for ultra-quiet filtration without disrupting sleep. Motor runs continuously for 24/7 water purification. Easy to Clean： It is very convenient to take out the biochemical cotton and wash it, or your can replace with other filter medium. If you have any questions about our products, please feel free to contact us and we will do our best to solve your problems. Ideal for Compact Tanks： Perfect for 4-13 gal (20-60L) aquariums: betta bowls, nano tanks, turtle habitats, and quarantine setups. Max depth: 0.5m. Voltage: 230V.