There have been many advances made over the last few years in the technology applied to the field of aquarium filtration. Today's aquarists can't really make sensible choices between different types of filtration devices unless they can make truly informed choices, and this holds true for both freshwater and saltwater hobbyists. This book provides information that will benefit both experienced and beginning aquarists in making the proper choice of filtration equipment from among the many types offered. Practical recommendations are made about which types of equipment are best suited to particular aquarium situations, and readers will learn exactly why certain filters perform specific filtration tasks more efficiently than others.