YL-3 Aquarium Round Top Filter (Hang-On-Back for Bowls) Type: Hang-on-back filter, designed specifically for aquariums and fish bowls Functions: 3-in-1 system – pumping, aeration, and filtration Filtration: Multi-layer filtration media (sponge and floss) remove debris, dirt, and impurities from water Water Flow: Adjustable flow rate with a regulating valve for optimal water circulation Oxygenation: Increases oxygen levels for healthier fish and aquatic plants Installation: Easy to hang on the rim of aquariums or bowls, compact and space-saving Safety: Safe for all types of freshwater fish and live plants Maintenance: Removable filter components allow easy cleaning and replacement