• Provides biological filtration, which reduces ammonia and other harmful organic waste substances.
• Can be placed under the fish tank, away from view.
• Measures 
• Single 1" intake
• Includes bio balls, drip tray & cover, filter pad, overflow box, return nozzle with vinyl 3/4" tubing (5/8 ID), 1" bulkhead, and 3ft x 1.25" flex hose. 
• No Prefilter included
• Requires a water pump - NOT INCLUDED

THIS ITEM HAS NEVER BEEN USED IN AN AQUARIUM SETTING, HOWEVER IT WAS ON DISPLAY, OUTSIDE OF ITS BOX. The acrylic is clear for the most part, but the edges show some yellowing, as seen in the picture. You are getting a great price for that reason! ;-)