Penn-Plax Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks - Two 11.2 inch x 11.25 inch Plates - Under Gravel System for Clear, Clean Water - Safe for Freshwater and Saltwater Tanks

Features

• NOTHING LIKE OLD SCHOOL: The Clear-Free Premium Under Gravel Filter is air driven and utilizes an Air Pump (not included) to cycle crystal clear water throughout your aquarium, while keeping a crisp and neat look inside. This means theres less moving parts, making for simplistic and easy maintenance. This filter is suitable for most 15 20 (high) gallon aquariums.
• BIOLOGICAL, CHEMICAL, AND PHYSICAL FILTRATION: As air is pushed through the Air Stones and rises through the Lift Tubes, water is gently suctioned through gravel and the filter plates, allowing both air and water to pass through the Filt-a-Carb Activated Carbon Cartridges. When water continues to be drawn through, anaerobic bacteria collects and colonizes within the gravel and filter plates.
• ALSO AERATES YOUR TANK: Since the Clear-Free Premium Under Gravel Filter is air driven through the use of Air Stones and an Air Pump (not included), it also aerates your tank. In essence, your aquarium is being filtered and aerated at the same time, though the same system. Its a filter and bubbler in 1.
• ITEMS INCLUDED: The Clear-Free Premium Under Gravel Filter includes 2 Filter Plates, 2 Adjustable Lift Tubes, 2 Straight Airline Tubes, 3 Filter Plate Connecters, and 2 Replaceable Filt-a-Carb Activated Carbon Media Cartridges.
• MEASUREMENTS: Each Filter Plate Separately 11.25 (W) x 11.2 (D) / Filter Plates Together 22.5 (W) x 11.2 (D) / Each Lift Tube at Filter Plate Base 12 15
• COLOR MAY VARY: Please note: the plates that go on the bottom of your tank beneath a layer of gravel or other substrates may be Blue or Black.