Used media from a liquid filtration tank is wound on a reel assembly having a pair of flat, circular end plates, a central spindle and a pair of hollow rods. End portions of the spindle extend through central openings in the end plates which may be releasably engaged with the spindle by set screws. The spindle end portions are cut away on one side to allow radial movement on and off a pair of spaced, axially aligned, rotatably supported stub shafts to which the end portions may be releasably attached by hitch pins extending through aligned openings in the spindle end portions and stub shafts. A pair of lugs are affixed to and extend inwardly from the inner surfaces of the end plates, equally spaced on diametrically opposite sides of the central opening. The lugs extend into the ends of the hollow rods when the reel assembly is rigidly assembled, and are released from the rods by releasing the engagement of one or both end plates with the spindle and removing the end plate. A bundle of used media wound about the two rods may then be easily removed. Frame means support a motor which is drivingly engaged with one of the stub shafts, a guide roller and a scraper bar over which the media pass to remove a significant amount of the contaminants from the media surface.