Aquarium filters play a crucial role in maintaining water quality and providing a healthy environment for fish and other aquatic life. There are different types of aquarium filters, including suspended filters, sponge filters, and submersible filters, each with its own unique mechanisms and advantages. Suspended filters are external filters that hang from the back of the aquarium. They typically consist of a pump that draws water from the tank, passes it through filter media (such as sponges, ceramic rings, or activated carbon), and then returns the filtered water to the tank.