Charles Austen ET Series Air Pumps
Reliable Low Noise Aeration for Ponds, Septic Tanks and Wastewater Systems
The Charles Austen ET Series is one of the most trusted ranges of linear diaphragm air pumps available for ponds, septic tanks, sewage treatment plants and aquaculture systems. Designed for continuous duty operation, these pumps deliver consistent airflow while maintaining excellent energy efficiency and very low noise levels.
Charles Austen air pumps are widely used in koi ponds, garden ponds and wastewater treatment systems where reliable aeration is essential. Their robust construction, quiet operation and dependable diaphragm technology make them a popular choice for both domestic and commercial installations.
Built with durable weather resistant housings and advanced green drive motor technology, ET Series air pumps are designed to run twenty four hours a day while keeping electricity consumption low.
Efficient Aeration for Ponds and Water Systems
In pond environments, reliable aeration plays a key role in maintaining water quality and fish health. Air pumps increase dissolved oxygen levels while improving water circulation throughout the pond.
As bubbles rise through the water column they create gentle vertical movement, helping oxygen mix throughout the pond while preventing stagnant areas from forming. This increased oxygen supply supports the beneficial bacteria responsible for breaking down ammonia and nitrite within filtration systems.
Charles Austen ET air pumps are widely used in:
- Koi ponds
- Wildlife ponds
- Garden ponds
- Estate ponds
- Lake aeration systems
- Aquaculture tanks
Their quiet operation and low vibration make them particularly suitable for residential gardens and landscaped environments where noise levels are important.
Proven Performance in Septic Tanks and Sewage Treatment Systems
The ET Series is also commonly used in septic tanks and domestic sewage treatment plants.
These systems rely on aerobic bacteria to break down organic waste efficiently. In order for these bacteria to function properly, a continuous supply of oxygen must be delivered to the treatment chamber.
Charles Austen ET air pumps provide the steady airflow required for this process, helping maintain effective treatment performance while reducing the risk of odours and system instability.
Thanks to their compact design and weather resistant construction, ET pumps are easy to install inside treatment plant housings or external service enclosures.
Why Choose a Charles Austen ET Series Air Pump
The ET Series has been engineered specifically for applications that require dependable, continuous aeration.
- Reliable diaphragm technology delivering consistent airflow
- Energy efficient green drive motors reduce running costs
- Quiet operation ideal for residential environments
- Weather resistant housings suitable for outdoor installation
- Low vibration design for stable operation
- Compact footprint for easy installation
- Service kits available to extend pump lifespan
- Suitable for ponds, aquaculture systems and wastewater treatment plants
Choosing the Right Charles Austen ET Air Pump
The Charles Austen ET range includes several models designed to suit different airflow requirements and aeration applications. Selecting the correct pump depends on factors such as pond size, water depth, fish stocking levels or the airflow requirements of a sewage treatment system.
Smaller models such as the ET30 and ET40 are ideal for small garden ponds, wildlife ponds and compact domestic sewage treatment units where lower airflow is required. These pumps provide reliable aeration while remaining extremely quiet and energy efficient.
Mid range models including the ET60, ET80 and ET100 are commonly used in koi ponds, medium sized garden ponds and residential wastewater treatment systems. These pumps provide higher airflow, making them suitable for powering pond diffusers, aerated bottom drains and moving bed filters that rely on continuous aeration.
The ET150 provides increased airflow for larger ponds, estate ponds and higher demand treatment systems where additional oxygen supply and water movement are required.
For larger aeration systems, the Enviro ET Double Series ranges from ET250 to ET500. These pumps deliver significantly higher airflow at increased pressure and are commonly used for lake aeration, fish farms, large ponds and commercial wastewater treatment plants. Despite their higher output, they remain quieter and more compact than traditional rotary vane compressors, making them a popular choice for large scale aeration systems.
Choosing the correct Charles Austen ET pump helps ensure stable oxygen levels, reliable biological filtration and long term system performance.
Why Buy Charles Austen Air Pumps from That Pond Guy
When you buy from That Pond Guy you are purchasing from pond specialists who design, build and maintain ponds every week.
- Expert advice based on real pond systems
- Genuine UK supplied equipment
- Full manufacturer warranty support
- After sales technical support
- Fast UK delivery
- Trusted by pond owners and professionals
Because we install and maintain aeration systems ourselves, we understand which equipment performs reliably in real world pond environments.
Charles Austen ET vs ETA vs ETAO Air Pumps
Charles Austen produces several versions of its popular linear diaphragm air pumps, each designed for slightly different applications depending on the level of monitoring and control required.
The Charles Austen ET Series is the standard range and provides reliable, energy efficient aeration for ponds, aquaculture systems and sewage treatment plants. These pumps are widely used where dependable airflow and quiet operation are the main priorities.
The Charles Austen ETA Series builds on the ET design by adding a built in pressure alarm system. This provides both an audible warning and LED indicator if airflow drops, helping detect problems such as blocked airlines or worn diaphragms before they affect the system.
The Charles Austen ETAO Series includes the same alarm system as the ETA range but also features an external alarm output connection. This allows the pump to trigger an external warning beacon, alarm panel or monitoring system, making it ideal for installations where remote monitoring or additional safety protection is required.
All three ranges use the same proven linear diaphragm technology and are designed for continuous operation, providing reliable aeration for ponds, koi systems, aquaculture installations and wastewater treatment systems.
Charles Austen ET Series – Frequently Asked Questions
What is the Charles Austen ET Series?
The Charles Austen ET Series is a trusted range of linear diaphragm air pumps designed for reliable, continuous aeration. These pumps are widely used in garden ponds, koi ponds, aquaculture systems, septic tanks and sewage treatment plants.
They deliver a steady flow of low pressure air that increases oxygen levels and supports biological processes. In ponds this helps maintain healthy water conditions for fish and filtration bacteria. In wastewater systems it provides the oxygen required for aerobic bacteria to break down waste efficiently.
ET pumps are known for their quiet operation, low running costs and long service life.
What are Charles Austen ET air pumps used for?
Charles Austen ET air pumps are used wherever reliable aeration is required.
Typical applications include:
- Garden ponds and koi ponds
- Moving bed biological filters
- Aerated bottom drains
- Lake and estate pond aeration systems
- Aquaculture tanks and fish farms
- Septic tanks and domestic sewage treatment plants
- Wastewater treatment systems
Because they produce consistent airflow with very low noise levels, they are suitable for both domestic and commercial installations.
Why is aeration important in ponds?
Aeration plays a critical role in maintaining a healthy pond ecosystem.
Air pumps increase dissolved oxygen levels while improving circulation throughout the water. Oxygen supports fish health and allows beneficial bacteria inside filtration systems to break down ammonia and nitrite produced by fish waste.
Without sufficient oxygen, ponds can develop stagnant zones and unstable water conditions.
Are Charles Austen ET pumps suitable for koi ponds?
Yes. ET pumps are widely used in koi ponds because they provide reliable aeration while operating quietly.
Koi ponds typically require higher oxygen levels due to stocking density and feeding levels. Aeration helps maintain stable oxygen levels while supporting biological filtration systems that process fish waste.
ET pumps are commonly used to power air stones, diffusers, aerated bottom drains and moving bed filters.
What size Charles Austen air pump do I need?
Choosing the correct air pump depends on airflow requirements.
Factors such as pond size, pond depth, fish stocking levels and the number of diffusers or filtration systems being powered all affect the pump size required.
Smaller pumps such as the ET30 or ET40 are suitable for smaller garden ponds or compact sewage treatment plants. Medium sized pumps such as the ET60, ET80 and ET100 are commonly used for koi ponds and filtration systems.
Larger pumps such as the ET150 and the ET Double Series models are designed for large ponds, lakes and commercial treatment systems.
How much electricity does a Charles Austen ET air pump use?
Electricity usage depends on the size of the pump.
Smaller models such as the ET30 or ET40 use relatively low power, while larger models such as the ET150 or ET200 require more electricity to generate higher airflow.
Despite running continuously, ET pumps use energy efficient motors that help keep running costs low.
Do pond air pumps need to run all the time?
Yes. In most pond systems aeration should run continuously.
Beneficial bacteria inside filtration systems rely on oxygen to break down ammonia and nitrite. If aeration stops for extended periods these bacteria can become less effective.
Continuous aeration also helps maintain stable oxygen levels for fish.
Can Charles Austen ET pumps run multiple air stones or diffusers?
Yes. ET pumps can operate multiple air stones or diffusers when connected through a manifold or air splitter.
This allows aeration to be distributed evenly throughout a pond or filtration system. Larger ET models are commonly used to power multiple diffusers or aerated bottom drains.
What size pond can a Charles Austen ET air pump support?
The size of pond an air pump can support depends on pond depth, fish stocking levels and the number of diffusers being used.
Smaller pumps such as the ET30 or ET40 are suitable for wildlife ponds or small garden ponds. Medium sized pumps such as the ET60, ET80 and ET100 are commonly used in koi ponds and filtration systems.
Larger pumps such as the ET150 and the ET Double Series models are designed for large ponds, lake aeration systems and commercial installations.
Can Charles Austen ET pumps power moving bed filters?
Yes. ET air pumps are commonly used to power moving bed biological filters.
Moving bed filters rely on aeration to circulate biological media inside the filter chamber. This agitation allows beneficial bacteria to grow and process ammonia and nitrite efficiently.
Reliable airflow is essential for proper filter performance.
Can ET pumps be used with aerated bottom drains?
Yes. Many koi pond systems use aerated bottom drains powered by air pumps.
The rising column of bubbles helps improve circulation across the pond floor and encourages debris to move toward the drain. This improves filtration efficiency while increasing oxygen levels.
Can ET pumps be used with pond diffusers?
Yes. ET pumps are commonly used with pond diffusers and air stones.
Diffusers release fine bubbles into the water, increasing oxygen levels and improving circulation throughout the pond.
Where should a pond air pump be installed?
Air pumps should be installed on a stable surface above water level where possible.
Installing the pump above the pond helps prevent water flowing backwards through the airline. Pumps should also be placed in a well ventilated area to allow heat to dissipate.
Many pond owners install pumps inside filter houses, sheds or protective cabinets.
How far can air be pumped from the pump to the diffuser?
Air pumps can usually push air several metres through airline tubing without difficulty.
The maximum distance depends on the pump output and airline diameter. Long airline runs or deep installations may slightly reduce airflow.
Can Charles Austen ET pumps be used for lake aeration?
Yes. Larger ET pumps are commonly used in estate ponds and lake aeration systems.
Models such as the ET150 and the ET Double Series provide the airflow required to operate large diffuser systems in lakes and large ponds.
Are Charles Austen ET pumps suitable for sewage treatment plants?
Yes. ET air pumps are widely used in domestic sewage treatment plants and septic systems.
These systems rely on aerobic bacteria to break down waste efficiently. The air pump provides the oxygen required for these bacteria to function properly.
Without aeration the treatment process would become ineffective.
How does an air pump work in a sewage treatment plant?
In a sewage treatment plant the air pump delivers oxygen into the aeration chamber.
This oxygen allows aerobic bacteria to break down organic waste and pollutants. The process helps convert waste into treated water that can safely disperse into drainage fields.
Reliable aeration is essential for the treatment process to function correctly.
Can a Charles Austen pump replace the air pump in a sewage treatment plant?
Yes. ET pumps are often used as replacement air pumps in sewage treatment plants.
When replacing an existing pump it is important to match the airflow rating of the original pump to ensure the treatment system continues operating correctly.
Why is aeration important in wastewater treatment systems?
Aeration allows aerobic bacteria to break down organic waste and harmful compounds.
Without oxygen these bacteria cannot function effectively, which can lead to reduced treatment efficiency, unpleasant odours and poor water quality.
Reliable air pumps ensure the treatment process continues working correctly.
How often should a sewage treatment air pump run?
Air pumps in sewage treatment plants normally run continuously.
Continuous aeration ensures bacteria receive a constant supply of oxygen to break down waste effectively.
What happens if a sewage treatment air pump stops working?
If aeration stops for extended periods the biological treatment process can become less effective.
This may lead to poor treatment performance and unpleasant odours. For this reason it is important that air pumps are reliable and serviced regularly.
How often should a Charles Austen air pump be serviced?
Charles Austen recommends servicing ET pumps approximately every eighteen months.
Servicing usually involves replacing diaphragms and checking air filters. This helps maintain airflow and extends pump lifespan.
What causes an air pump to lose airflow?
Reduced airflow is usually caused by worn diaphragms, blocked air filters or restrictions in airline tubing.
Replacing diaphragms and checking airlines normally restores proper airflow.
How long do ET pump diaphragms last?
Diaphragms gradually wear due to constant movement.
Under normal conditions they typically last around eighteen months before replacement is recommended.
Can ET air pumps be repaired?
Yes. ET pumps are fully serviceable.
Service kits are available containing replacement diaphragms and internal components that restore pump performance.
Are Charles Austen ET air pumps oil free?
Yes. ET pumps are completely oil free.
This ensures the air delivered into ponds or treatment systems is clean and free from contamination.
Can ET pumps be used indoors?
Yes. ET pumps can be installed indoors provided there is adequate ventilation.
Many sewage treatment systems house the air pump inside a service chamber or enclosure.
What warranty is supplied with the Charles Austen ET Series?
Charles Austen ET air pumps are supplied with a two year UK manufacturer warranty when installed and maintained correctly.
