Penn-Plax Undergravel Aquarium Filter for 40-55 Gallon Tanks ? Four 11.25? X 11.25? Plates ? under Gravel System for Clear, Clean Water ? Safe for Freshwater and Saltwater Tanks (CFU55) 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 there?s less ?moving parts,? making for simplistic and easy maintenance. This filter is suitable for most 40 ? 55 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. It?s a filter and bubbler in 1. ITEMS INCLUDED: The Clear-Free Premium Under Gravel Filter includes 4 Filter Plates, 4 Adjustable Lift Tubes, 4 Straight Airline Tubes, 9 Filter Plate Connecters, and 4 Replaceable Filt-a-Carb Activated Carbon Media Cartridges. MEASUREMENTS: Each Filter Plate Separately = 11.25? (W) x 11.25? (D) / Filter Plates Together = 45? (W) x 11.25? (D) / Each Lift Tube at Filter Plate Base = 13.25? ? 16.5? PENN-PLAX presents the Clear-Free Premium Under Gravel Aquarium Filter. Those who?ve been around the aquatic block for a while know that Under Gravel Filters (UGFs) are a testament of time. This 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 there?s less ?moving parts,? making for simplistic and easy maintenance. It?s suitable for most suitable for most 40 ? 55 gallon aquariums, and is safe for Freshwater and Saltwater setups. 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! It?s a filter and bubbler in 1! Items Included: The Clear-Free Premium Under Gravel Filter includes 4 Filter Plates 4 Adjustable Lift Tubes 4 Straight Airline Tubes 9 Filter Plate Connecters 4 Replaceable Filt-a-Carb Activated Carbon Media Cartridges Measurements: Each Filter Plate Separately = 11.25? (W) x 11.25? (D) Filter Plates Together = 45? (W) x 11.25? (D) Each Lift Tube at Filter Plate Base = 13.25? ? 16.5? Shop PENN-PLAX for All Your Pet?s Needs: PENN-PLAX is a manufacturer and distributor of top quality pet supplies, who specialize in creating excellent pet products for animals, both great and small. Item model number CFU55 Product Dimensions 11.5 x 2.5 x 11.5 inches; 2.02 Pounds Country of Origin China Pattern Name Aquarium Filter Is Discontinued By Manufacturer No Manufacturer Penn Plax, INC. Shipping Fast shipping is very important for us. Our standard US shipping service is FREE. Your order will be shipped within 2-3 business days upon full payment received. Your order will be delivered within 2-3 business days after the handling time. We only ship to the confirmed PayPal address. We reserve the right to cancel any order for any reason at any time. We are not responsible for undeliverable addresses. Returns and payment We offer a 30 days return policy from checkout winning date. We allow only PayPal as payment method FeedBack Your feedback very important to us, after you get your package and you are satisfied with our service please leave us positive feedback If you have any problem with your order / any questions please before leave any type of feedback For any questions, using contact system Please visit our store to check out other items for sale! Thank you for shopping at our store.