Every process that happens in the pond is dependent on oxygen. This is especially important at night when plants are not converting CO2 into oxygen. Dissolved oxygen levels are generally lower in warmer water temperatures. Pond aerators oxygenate your pond, helping all biological processes and creating a more stable environment, resulting in healthier fish and plants. Aeration is also very important during winter months in colder climates, as aeration helps to keep a small hole open in the ice at the surface of the pond to aid in degassing.