The Aquadyne EcoSphere filtration systems are excellently suited to filter ponds and other aquatic habitats. Both models come standard with an Air Backwash system that performs just like the larger Aquadyne systems except in a small footprint package for smaller water features, ponds, aquaponic systems, quarantine systems, or other small aquatic habitats ranging in the 1000 to 4000 gallon class. These systems offer an efficient water flow. You can backwash with as little as 15 gallons of water. They include a 1.5" control head with 1.5" ports in/out, with (3) ea. 1.5" self-sealing unions included. These systems are also suitable for an indoor, large volume aquarium filter. These units are also an excellent starter for small laboratory research or aquaponic applications.