Eshopps' compact wet-dry filters fit comfortably in sumps without taking much space. The smart, easy-access sump allows for convenient installation of the return pump. Wet-dry drip tray filter provides efficient biological filtration to process toxic ammonia and nitrite. Includes overflow box, bio balls, drip tray and cover, egg crate, filter pad, return nozzle with vinyl tubing, 1in bulkhead, and 3 ft. x 1-1/4in flex hose. WD-75CS, WD-100CS, and WD-125CS have single 1in intake; WD-150CS, WD-200CS, and WD-300CS have dual 1in intakes.