A canister filtration system consists of a sealed container, the canister, typically placed outside the aquarium. It contains various filtration media, such as mechanical filter pads, biological media (like ceramic rings), and chemical filter media (like activated carbon). Water is drawn from the tank through an intake tube, entering the canister. Inside, it passes through the filtration media, removing debris, promoting beneficial bacteria growth, and possibly addressing chemical impurities. The filtered water is then returned to the tank via an outflow tube. Canister filters are known for their high capacity, versatility, and efficiency in maintaining optimal water conditions for aquarium inhabitants. Regular maintenance, including cleaning and replacing filter media, is crucial for their effectiveness.