Hydor Professional External Canister Filter – Aquarium External Filter – Telescopic Intake Tubes, Easy Priming – EcoSystem in a Box – Biological, Mechanical, Chemical Filtration – 600 to 345 gphThe hydro professional 600 aquarium external 345gph filter is a complete eco system in a box. All the biological, mechanical and chemical filtration that any environment requires for a healthy and long lived aquatic experience. From the easy priming feature to the telescopic intake tubes, everything had been made easy. The hydro professional 600 Aquarium External 345GPH Filter is a complete eco system in a box All the biological, mechanical and