An air pump is used during spring, summer, and fall to oxygenate your pond, helping all biological processes and creating a more stable environment. This results in healthier fish and plants. An air pump is used during winter to keep a small hole in the ice.
During warmer temperatures, the oxygen present in pond water fluctuates according to the number of fish, the accumulation of algae and sludge, and the time of the day. An air pump creates a huge column of bubbles at the bottom of a pond. This brings oxygen-depleted water to the surface where the bubbles burst and create surface turbulence, circulation, and aeration.
An air pump also increases levels of beneficial bacteria, reduces algae, and assists in the breakdown of sludge.