A water circulator is a powerful tool for fighting stagnation in ponds. In warmer weather, we have found them to be very good at circulating oxygenated water into more shallow coves and "hard to reach" places where a typical aerator would never cover very well.
You may also see them used as pond deicers during the winter months. They are particularly good at keeping an area of water open around boat docks, ramps, marinas, and decks, and they guard against ice damage that can often result from the pond or lake freezing over.
A pond circulator is quite simple by design. It uses a specially designed propeller, which is connected to a motor, and suspended under the water or horizontally under a float. Mounting and placement is done using two included 20' suspension ropes. An optional dock mount attachment is also available.
Depending on the brand, an optional time and temperature controller is available as well. During winter use, the thermostatically controlled temperature sensor will only turn the circulator on whenever freezing conditions exist.