This is an Open-Box item. It was run in freshwater as a test for 24 hours. Nothing wrong with it; it works as it should. All pieces are included. 
 
The Lifegard Hang-On Filter HOF-30 is a QUADRUPLE stage slim design filter with FOUR combination replicable cartridges. The flow rate of 160 GPH provides enough circulation for the recommended tank capacity. It is designed to keep your aquarium water sparkling clean with three full stages of filtration while allowing surface skimming to remove floating debris. The Filter Cartridge has Three-stages:
Stage 1 – Is a 40-micron removable sponge
Stage 2 – Is Activated Carbon
Stage 3 – Is 20 Micron Filter Pad
This hang-on filter is designed to trap large debris at the sponge level that can be removed with periodic cleaning. The activated Carbon removes dangerous toxins and cultivates beneficial bacteria for a healthy environment. Finally, for fine debris, there is a fine Filter pad.
Ideal for Freshwater or Saltwater Aquariums
The Lifegard Aquatics Hang-On Filter helps to create clean and clear water conditions and a healthy environment for aquatic life to thrive.
Provides maximum surface for longer filter cycle
A surface skimmer removes floating debris or oil leftovers by feeding dry food.
First-stage mechanical sponge filtration traps large debris like uneaten food and other organic materials.
Activated carbon for chemical filtration effectively removes dangerous toxins while encouraging the growth of beneficial bacteria, reducing harmful ammonia and phosphate buildup.
The top control system knob lets you slow down the water output, creating a gentle flow to protect delicate fish and plants.