It’s been getting colder and winter is upon us. If you have an aerator in your pond you maybe wondering what to do with it. Cold water holds more oxygen, animal and plant use of this oxygen is lower than in the winter than the summer, and oxygen-using decomposition is very slow. So, if the pond is open most of the winter or only has occasional ice cover, the pond should not have an oxygen problem. In this case, aeration is not benefitting the pond.