The Fluval 306 External Filter System 1150 LPH for aquariums up to 300 litres. The Fluval 306 delivers many practical benefits-including better filtration, less maintenance frequency, faster setup, and quieter operation-all designed to make fishkeeping more enjoyable. With enhanced functionality and filtration performance to help create the cleanest, healthiest aquariums ever. The unique square-shaped canister design ensures that the 306 holds 35 to 50% more water than round canister filters of a similar size. This square sizes allows better water flow through a complex cleansing path that maximizes contact with the filtration media throughout the filtration process. Features: Increased Hydraulic performance means less frequent maintenance. Increased water filtration performance means cleaner water. Sound Dampening impeller design means quieter operation. Re-engineered efficient priming system means easier starting. Strengthened lift lock clamps means a more secure closure system. New Media format means improved water quality.