The external power filter is the easiest and least complicated filter system for the beginner’s aquarium. These filters provide all three kinds of filtration and are specifically designed to turn over large amounts of water. The external power filter hangs on the side of the tank and is powered by its own motor. Water is drawn into the filter by a U-shaped siphon tube. it passes over layers of fibrous filter material and activated carbon and is returned to the tank via a gravity trickle system or a return pipe. Like the box filter, the power filter circulates the water, providing aeration.
While it works on the same premise as the box filter, the power filter is much more efficient at removing waste and debris from the tank. It does not need to be cleaned as frequently as the box filter. Many models have special filter cartridges that make cleaning these filters extremely easy. In addition, various types of cartridges can be purchased to chemically alter water quality and correct water chemistry problems.
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