The Charles Austen Enviro ET30 is a compact, energy-efficient linear diaphragm air pump designed to provide a dependable supply of oil-free air for pond aeration, wastewater treatment and other low-pressure air applications.

Delivering up to 30 litres of air per minute at 0.12 bar, the ET30 combines reliable airflow with a low electrical power consumption of just 25 W. Its robust, weather-resistant construction makes it suitable for indoor and outdoor installations where consistent aeration is required.

The ET30 is part of the Charles Austen enviro ET air pump range, developed for applications that benefit from continuous air delivery, including pond aeration and wastewater treatment systems.

Key Features and Benefits

• 30 L/min airflow: Provides a steady supply of air for aeration applications.

• Low-pressure performance: Rated airflow of 30 L/min at 0.12 bar.

• Energy efficient: Uses only 25 W of electrical power.

• Oil-free air delivery: Suitable for applications requiring a clean air supply without oil lubrication.

• Linear diaphragm technology: Designed for reliable, consistent air delivery.

• Weather-resistant construction: Suitable for appropriate indoor and outdoor installations.

• Compact design: Measures approximately 208 × 150 × 178 mm.

• Low-noise operation: Manufacturer literature lists noise levels as low as 35 dB(A).

• Serviceable design: Replacement service kits are available to support ongoing maintenance.

• Continuous-duty suitability: Designed for applications requiring sustained aeration.

Reliable Air Supply for Pond Aeration

The Enviro ET30 is suitable for pond aeration systems where a consistent air supply is needed to support water movement and oxygen transfer.

Connected to suitable air diffusers or air stones, the pump distributes air into the water, creating bubbles and circulation. This helps increase contact between water and air and supports dissolved oxygen levels.

Pond aeration can be particularly valuable in:

• Koi ponds.

• Garden ponds.

• Fish-holding systems.

• Aquaculture installations.

• Pond filtration systems.

The appropriate pump size depends on pond volume, water depth, diffuser resistance and the number of air outlets. The ET30 should be selected according to the required airflow at the operating pressure, rather than airflow alone.

Suitable for Wastewater and Septic Tank Aeration

The Enviro ET series is also designed for wastewater aeration applications.

Supplying air to an appropriately designed treatment system helps maintain oxygen availability for aerobic microorganisms involved in biological wastewater treatment.

The ET30 can be considered for suitable:

• Domestic wastewater treatment systems.

• Septic treatment installations designed for aeration.

• Small wastewater aeration applications.

• Biological treatment systems requiring a low-pressure air supply.

Always check the airflow and pressure requirements of the treatment system before selecting the pump.

Efficient 25 W Operation

The ET30 delivers its rated airflow while consuming only 25 W of electrical power.

This makes it an attractive option for installations where the pump needs to operate for extended periods.

Its principal performance specification is:

30 litres per minute at 0.12 bar

Actual airflow changes with operating pressure and the resistance of the connected air distribution system. Long air lines, small-diameter pipework, deep water and restrictive diffusers can all affect delivered airflow.

Weather-Resistant and Compact Construction

The Enviro ET30 has a robust, compact housing designed for use in suitable indoor and outdoor environments.

Its dimensions are approximately:

208 × 150 × 178 mm (L × W × H)

The compact design makes it easier to position close to a pond filtration system, wastewater treatment installation or other aeration equipment.

For outdoor installations, position the pump in a location that protects its electrical connection and prevents water ingress, flooding or excessive exposure to standing water. Follow the manufacturer's installation instructions.

Maintenance and Service Kits

The Enviro ET30 is designed to be serviceable, with replacement service kits available.

Charles Austen recommends servicing its enviro pumps at least every 18 months. Regular maintenance helps maintain reliable operation and allows wear components to be replaced before they cause a loss of performance.

The ET30 service kit includes components such as diaphragms and filters.

Maintenance should be carried out according to the manufacturer's service instructions, with the electrical supply disconnected before opening the pump.

Technical Specifications

Specification	Value
Manufacturer	Charles Austen
Product range	enviro ET Series
Model	ET30
Pump type	Linear diaphragm air pump
Maximum rated airflow	30 L/min
Rated airflow pressure	0.12 bar
Power consumption	25 W
Outlet connection	14 mm (confirm fitting supplied)
Dimensions (L × W × H)	208 × 150 × 178 mm
Weight	Approximately 4 kg
Construction	Robust, weather-resistant housing
Air delivery	Oil-free
Recommended service interval	At least every 18 months
Applications	Pond aeration and wastewater aeration

What's Included?

The manufacturer's ET-series documentation identifies a rubber elbow connector as a supplied fitting.

Please check the exact package configuration with the supplier before specifying additional brass fittings, hose clips or airline accessories as included.

Is the Charles Austen Enviro ET30 Right for You?

Choose the Enviro ET30 if you need a compact, energy-efficient air pump delivering up to 30 L/min for pond aeration or a suitable wastewater treatment application.

It is particularly suitable for:

• Small and medium pond aeration arrangements where 30 L/min is sufficient.

• Koi pond filtration systems with appropriately sized diffusers.

• Wastewater treatment systems requiring a continuous low-pressure air supply.

• Installations where low electrical consumption is important.

• Users looking for a serviceable alternative to inexpensive disposable air pumps.

Before purchasing, check the required airflow, working pressure, pipe diameter and diffuser resistance of your installation.

Choose the Charles Austen Enviro ET30 for dependable, energy-efficient aeration with 30 L/min rated airflow.