Last updated: August 7, 2021

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If you create a pond in your garden at home, you should also take good care of it. Special equipment can take some of the work off your hands. Especially pond aerators are important because they supply the water with enough oxygen. Especially if you keep fish in your pond, you should not neglect this topic and inform yourself about pond aerators. The fish will thank you for it!

In our big pond aerator test 2021 we compared several models, worked out the advantages and disadvantages and found answers to frequently asked questions. This should help you to find out what you need to consider in order to find the optimal pond aerator for you and your pond.

The most important facts

  • A pond aerator supplies your pond with oxygen. Fish in particular, such as koi, depend on there being plenty of oxygen in the water.
  • The models always consist of a pump and one or more diffusers, which are connected to each other by a hose. The air is sucked in by the pump and then bubbled into the water via the outlets.
  • Pond aerators can be powered by solar energy or electricity and have different power ratings. The larger the pond and the more fish live there, the higher the power of the pond aerator should be.

The best pond aerator: Our picks

Buying and evaluation criteria for pond aerators

Now we present a few criteria that you should keep in mind when looking for the right pond aerator.

In summary, these are:


When you are looking for a pond aerator, the most important thing to consider is the power of the device.

The larger the pond, the higher the power should be.

The larger your pond is and the more fish, plants etc. live in it, the higher the pump capacity of your pond aerator should be. As a general rule, the pumping capacity, i.e. the volume of air pumped in per hour, should correspond to about a quarter of the pond volume.

The pond aerators available on the market have a wide range of power. They start at 2 watts, which is suitable if you have a small pond of about 500 litres in your garden.

For larger ponds, of course, you need more power, and the most common models range up to 35 watts.


In addition to the power (watts), the pressure (bar) of a pond aerator is also very important. This refers to the pressure with which the air is forced out of the aerator into the water. The more pressure, the better the oxygen supply in the water.

The manufacturers specify the pressure with which the oxygen is pressed out of the aerator into the water. You should note, however, that the lowest distance between the diffuser and the pump is always assumed here.

The further away the pump and the diffuser are, the more the pressure is reduced.

So, for example, if the outlet is at the very bottom of the pond, the air has to be transported longer through the hose and thus arrives at a lower pressure.


Another criterion you should consider is how deep you can place the pond aerator. Here, of course, the size and depth of your pond is decisive.

Basically, the deeper the aerator is in the water, the higher the back pressure of the water and thus the lower the pressure with which the air is pressed out of the aerator.

Inexpensive and higher-priced models differ greatly in this respect. If you have a small pond, a cheaper model is also fine; these can usually be used up to a depth of 0.5 to 1 metre.

For larger ponds, however, it is worth investing in a more expensive model. These can still supply the pond with oxygen at a water depth of 3 metres without any problems.


The volume should not be ignored either, as too high a volume can also be somewhat disturbing. The noise level is specified by the manufacturer for each model in decibels (dB).

The volume of the pond aerator depends on several factors, one of which is the pump selected. Here, diaphragm pumps in particular have a lower noise level and are therefore more suitable than piston pumps.

Guide: Questions you should ask yourself before buying a pond aerator

In the guide section we now answer the most frequently asked questions about pond aerators and their use. This should make your choice a little easier.

What is a pond aerator?

A pond aerator supplies your pond with oxygen. A pond aerator is especially important if plants or fish live in your pond. Koi ponds in particular depend on a good oxygen supply.


When you create a pond, you should also take good care of it. A good oxygen supply is also part of this.
(Image source: Couleur / pixabay)

The pond aerator consists of several parts. On the one hand, there is the pump, which stands outside the water to suck in air. This air is then transported through the thin hose to the aerator, which is located in the pond, under water.

Once it arrives, the air is then transported into the water under pressure, thus supplying the pond with the necessary oxygen.

What is special about a pond aerator and what advantages does it offer?

Especially in fish ponds, a sufficient oxygen supply is necessary to provide a good environment for the fish. Especially in summer, fish have a higher oxygen demand and thus the oxygen supply must be maintained artificially.


Poor oxygen supply can be dangerous, especially for koi.
(Image source: endriqstudio / pixabay)

Another advantage of a pond aerator is that it can support the filters.

The small air bubbles that are created when the air is pressed into the water mix the water layers. This supports the filter by helping it to suck in and remove algae and other debris.

What types of pond aerators are there?

We have divided the pond aerators here into two categories based on the power supply, powered pond aerators and solar powered pond aerators.

Electric pond aerators

In the case of conventional pond aerators with a mains connection, there is a wide choice of models and also different power levels are available. By connecting it to the mains, the pond aerator provides the pond with a constant supply of oxygen at all times.

  • reliable
  • different power levels
  • running costs

One disadvantage, however, is that it is dependent on a mains supply and you therefore need a socket near the pond or have to lay an extension cable. The constant power supply also results in constant operating costs, depending on the power and model.

Solar-powered pond aerators

Solar-powered models are particularly suitable if you are concerned about the environment and want to save a little money. Unlike conventional pond aerators, there are no additional electricity costs apart from the purchase price.

Another advantage is that no connection to the mains is required. This means you can easily set up your pond aerator anywhere without having to organise an extension cable.

  • environmentally friendly
  • cost-saving
  • no power connection necessary
  • dependent on solar radiation

The pond aerator does rely on solar radiation, but many models have a rechargeable battery that stores excess energy.

How much does a pond aerator cost?

Pond aerators come in a wide variety of models. In the table, we would like to give you an overview of the different prices of the most common models.

Type Price
Solar pond aerator from 30€
Low-power pond aerator (2 Watt) from 20€
High-power pond aerator (30 Watt) 60€

The more expensive the model, the better it is generally suited to large and deep ponds.

What are the alternatives to a pond aerator?

Especially if you have a fish pond, you should not neglect the oxygen supply. Besides pond aerators, there are other options for getting enough oxygen into your pond.

Alternative Advantages Disadvantages
Stream good oxygen supply costly
Fountain good oxygen supply some water plants do not like to be wetted by splashing water

We describe the alternatives in detail so that you know more about them.

  • A stream: can be artificially created to get the water moving. The circulation of the water brings additional oxygen into the pond. However, this alternative requires a little more work and a pump to bring the water to the desired height.
  • A fountain: can also have the desired effect. The splashing of the water provides the pond with enough oxygen. Fountains consist of a pump that pumps the water upwards and a spray head that makes the water rain back into the pond.

The application, your requirements and your personal taste will show you whether a pond aerator or an alternative is right for you.

How do I install a pond aerator?

The installation of a pond aerator is very simple, you just have to place the individual parts correctly.

  1. The pump is always placed outside the pond, preferably as close to the edge as possible. To ensure that the pump can draw in enough oxygen, make sure that it is free-standing. You can also protect it from rain or dirt with a cover.
  2. If you have an electric model, make sure you have a socket nearby that is compatible with the power of the pond aerator. This should of course also be protected from dirt and splashing water.
  3. You then simply place the aerator in the water. You should make sure that the pump and the aerator are not too far apart. A greater distance between the pump and the diffuser results in a loss of pressure.

Once you have placed everything correctly and connected it to the power source, you can switch the pond aerator on.

Can I use a pond aerator in winter?

Even in winter, the fish in your pond need an adequate oxygen supply.

In winter you should make sure that the pond aerator does not disturb the fish.

The fish are in the deeper part of the pond in winter because the water is warmer here. With the pond aerator, you should make sure that the outlet is placed at some distance from the fish so that the fish are not disturbed.

As the oxygen distribution of the pond aerator mixes the water layers, it could be that the fish freeze. To prevent this, you can install a pond heater to prevent the water temperature from getting too low.

Image source: podius / 123rf

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