under-gravel filters usually offer mechanical and biological filtration.Īn under-gravel filter is placed at the bottom of an empty aquarium and a gravel substrate is placed over the bottom grid. It works by trapping particles in the water while offering a large surface area for beneficial bacteria to flourish. Although under-gravel filters have lost their popularity throughout the years, many people still use these filters because of their benefits in aquariums.Īn under-gravel filter is a type of bottom filtration system used in various aquariums. Under-gravel filters have been around for decades, and they are one of the first filters ever created for aquariums. They generally offer one or more types of filtration, such as biological, mechanical, or chemical. Filters help keep the water clean and moving while reducing the accumulation of dirt and debris. There are many different filters available to suit different types of aquariums, regardless of their size and overall appearance.

Filters are a vital component for aquariums and perhaps one of the most important tools.

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