5 Brilliant Benefits of a Pool Aerator

As we immerse ourselves in the world of pool maintenance, a common question arises: What does an aerator do for a pool? This seemingly simple inquiry delves into the heart of pool care, especially for those facing the challenge of overheated pool water during scorching summers. While many methods exist to cool pool water, the aerator stands out as a particularly effective solution. In this article, we’ll explore the intricacies of pool aerators, shedding light on their mechanism, benefits, and considerations for optimal use.

Key Takeaways

  • Understanding Pool Aerators: Aerators work by oxygenating pool water, thereby cooling it, enhancing pH levels, and improving chemical efficiency.
  • Benefits in Hot Climates: Particularly beneficial in hot, arid regions, aerators effectively reduce water temperature and make the swimming experience more enjoyable.
  • Selective Utility: Not all pools may need an aerator, especially if other water features are present or in humid climates where the aerator’s efficiency diminishes.
  • Balancing Aeration: While beneficial, excessive aeration can lead to imbalances in pH levels and increased water evaporation, underscoring the importance of moderation.

What An Aerator Does For A Pool

Almost everything about an aerator is positive, but there are a few aspects that pool owners must be aware of in terms of over-aerating the water.

How An Aerator Works

An aerator can be mounted on the coping or deck of your pool and connected to the return line. For above-ground pools without suitable decks, there are aerators designed to float on the surface or those that clamp to the side wall of the pool.

The aerator is connected to the return line nozzle, and the pump then forces water through the aerator into the air. Before landing back in the pool, the droplets absorb oxygen, which is then infused into the pool’s water.

Benefits of a Pool Aerator

There are several benefits to installing a pool aerator, particularly for pools in areas with long, hot summers.

An Aerator Will Cool Your Pool

With consistently high air temperatures, it’s inevitable that the pool water will warm to the point where it’s no longer refreshing. Using the aerator, water is pumped into the air, lowering the pool’s temperature through evaporative cooling.

Ideally, there should be a marked difference between air and water temperature for the aerator to work effectively, so it’s always better to use it at night. It also works better in dry, arid air – if you live in a humid climate or the air doesn’t cool at night, an aerator might not be too effective. Given the right conditions, it should lower the temperature of your pool by 3-4 ⁰F.

An aerator is recommended for above-ground pools, which can get even hotter than inground pools as heat is transmitted through the side walls. Because they are usually shallower, without a deep end, the water temperature increases even faster.

An Aerator Raises pH Levels without Raising Alkalinity

The pH of your pool should ideally be between 7.2 and 7.6. If you need to raise the pH levels in your pool without affecting total alkalinity, aeration is the way to do it. By increasing the oxygen levels in the water, there is an increased “off-gassing” of carbon dioxide, which has the effect of increasing the pH of the water but has no impact on total alkalinity.

Aerators Improve Water Circulation

The turbulence created by the aerator and the oxygenation of the water has a positive effect on the circulation in the pool, preventing any stagnant areas from forming that would otherwise have a build-up of debris and provide perfect homes for algae and bacteria.

There Is More Efficient Use Of Chemicals With Aerators

The increased circulation, coupled with the infusion of oxygen that aeration causes, helps the pool chemicals get absorbed and makes them more effective. In the long run, an aerator will save rather than cost money as fewer chemicals are required to keep the pool in a healthy state. Not only are the chemicals more evenly distributed, but the opportunity for algae to establish their colonies is reduced, so fewer are required.

Do All Pools Benefit From An Aerator?

It is a fact that all pools will enjoy the benefits I’ve listed, but it’s also true that not all pools need to have an aerator installed. Here’s why:

  • Your pool might already have a fountain, a waterfall, or bubblers. All these water features will play a role in oxygenating or aerating the water, in which case an additional aerator will probably not make much difference and is not worth the expense.
  • Aerators work best in hot, dry conditions, where evaporation and the cooler night air will impact water temperature. If you live in a humid, warm climate, the aerator won’t do much cooling. You might choose to rely on swiveling the regular return jets upwards to agitate the water enough to achieve the other benefits of an aerator.

Can You Over-Aerate A Pool?

The standard time to run an aerator is 6-8 hours per day, and as I mentioned, it’s best to do this at night.

Over-aeration may result in the pH rising above the recommended level of 7.2 to 7.6, which in turn can lead to a calcium build-up and possible damage to the pool’s equipment.

In a hot, windy environment, the aerator will cause a substantial amount of evaporation, which is great for cooling the pool, but you’ll find it necessary to top up the water more often, adding to your utility bill.


An aerator is an inexpensive but effective addition to your pool equipment, helping in several ways to improve the quality of the water by oxygenating it, increasing the pH level without disturbing alkalinity, and making it less hospitable to algae and bacteria. It can also be used to drop the temperature by a few degrees, as long as the conditions are right, and to top it all, it’s a visual delight. So, why not get aerating!