How to Choose the Right Pond Aerator

A pond aerator is one of the most essential purchases for establishing a healthy pond environment. Proper aeration both reduces algae growth and increases the oxygen supply to fish and other organisms living in your pond. In summer months, sufficient oxygen is crucial for fish health, while in winter, aeration prevents your pond from freezing completely, which can lead to trapped toxins and a mass fish kill. With all the pond aerator options on the market, choosing the right one can be overwhelming. Here are some important factors to consider when making your selection.

The Size of Your Pond

Estimate your pond’s volume by measuring  the circumference with a measuring wheel to find the area, and multiplying that by your pond’s depth. Different aerators will be more efficient in small ponds than large ponds, so it is important to have an idea of your pond’s volume. Research different models to see if the aerator you want is compatible with your pond.

The Type of Aerator

There are two basic types of pond aerators– surface and bottom. Surface aerators sit on the pond’s surface and function by churning the water. There are also decorative surface aerators which create a fountain effect. Bottom aerators work by injecting oxygen into the bottom of the pond and allowing the gas to pass to the top through bubbles. These aerators are better for ponds that are deeper than 6 feet. Surface aerators are generally less expensive than bottom aerators, though fountain aerators can be more expensive.

The Shape of Your Pond

Depending on your pond’s shape, you may need multiple aerators. Aerators create ripple currents which bounce off the walls of your pond. If your pond curves or has hard-to-reach areas, these currents may not make it to those places. Additional aerators may need to be strategically placed to ensure that your entire pond is well aerated.

The Setup Around Your Pond

An important thing to consider is how you will power your aerator. Look at how far away your power source will be before selecting an aerator model. If electricity is not nearby, some air diffuser systems have tubes that can run up to 2,000 feet away from the pond.


Different types of aerator systems have different levels of maintenance required, though all will require some upkeep. Make sure to consider the time and energy involved with each system as well as more obvious factors such as price.

Additional Features

Many pond aerators have additional features that can factor into your decision. Heated aerators keep your pond at the perfect temperature year round. Other aerators come with extra long extension cords, or have extended warranties. Read the fine print to make sure that you get the aerator that’s right for you.

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