The Hagen Fluval U1 Underwater Filter can be used as as a primary filter in smaller aquariums or as a supplementary filter for larger aquariums. Also great for tanks with low water levels.

Features:

• Will run efficiently in a horizontal or vertical position
• For aquariums up to 15 US Gallons, or as as supplemental filter for all aquarium sizes.
• Ideal for use in all aquarium or reptile environments
• Flip-Top for quick and easy maintenance
• Adjustable flow rate
• Includes 1 foam filter pad
• Output diverter