Aquadyne 2000 - Model .60B Filtration system is excellently suited to filter ponds and other aquatic habitats up to 2000 gallons. This filter is an excellent performer with most any external pump up to 3,900 GPH. The Dynamax Air Assist Backwash aggressively agitates the debris collected in the media bed and suspends it in the water column which is easily backwashed to waste, conserving water, and deep cleaning the filter media bed. The AD2000 is very suitable for an excellent indoor large volume aquarium filter. This unit is also an excellent starter for small laboratory research applications.