Written by Tyler Ruoff, Fisheries Biologist
Edited by Lucas Quinn, Marketing & Communications
As summer begins to wind down, it’s a good time to think about your pond’s aeration system. One of the most common questions we get is whether an aerator should run year-round.
For most ponds, the answer is no.
Our fisheries biologist, Tyler Ruoff, recommends operating pond aeration systems from April through October. Once water temperatures begin to cool, the benefits of aeration drop off significantly. Shutting the system down for the winter can save on electricity without sacrificing the health of your pond.
Here’s why.
1. Microbial Activity Slows Down
One of the biggest benefits of aeration is helping beneficial bacteria break down leaves, fish waste, and other organic material that settles on the pond bottom.
As water temperatures fall, those bacteria become far less active. By winter, microbial activity is nearly at a standstill. Since there is very little decomposition taking place, there is little benefit to continuing to run your aeration system until water temperatures begin warming again in the spring.
2. Thermal Stratification Is No Longer a Concern
Throughout the spring and summer, ponds naturally separate into layers of warm and cold water. This process, known as thermal stratification, can leave the deepest parts of a pond with very little oxygen.
An aeration system keeps the water mixed and oxygen levels balanced throughout the pond.
As temperatures cool in the fall, the pond naturally mixes on its own. Without thermal stratification, the primary reason for running an aeration system is gone.
3. Winter Aeration Can Attract Unwanted Waterfowl
Leaving an aeration system running through the winter often keeps sections of the pond from freezing.
While that may not seem like a problem, open water is an invitation for geese and other waterfowl. Once they move in, they leave behind waste that adds phosphorus and other nutrients to the pond. Over time, those excess nutrients can contribute to algae blooms and declining water quality.
Our Recommendation
For the vast majority of ponds, we recommend running your aeration system from April through October. During those months, your system is providing the greatest benefit by improving oxygen levels, supporting beneficial bacteria, and preventing thermal stratification.
When winter arrives, it’s time to give your system a break. You’ll reduce operating costs, avoid attracting unwanted waterfowl, and have your aeration system ready to go when pond season returns in the spring.
Winter is also the ideal time to have your aeration system inspected. A quick service visit can identify issues before they become costly repairs or leave your system underperforming next season. Simple maintenance such as cleaning the cooling fan, replacing the air filter, or checking air pressure and airflow can make a big difference in overall performance. Our team can inspect your system and make sure it’s operating the way it was designed, so you’re ready to get the most out of it when spring arrives.