The Charles Austen Enviro ET100 is a high-capacity, oil-free linear diaphragm air pump designed for large pond aeration systems, koi ponds, hydroponics, aquaculture and other applications requiring a substantial supply of air.

Delivering a rated airflow of 100 litres per minute at 0.10 bar, the ET100 is designed for installations where smaller air pumps cannot provide sufficient airflow. Its high output makes it suitable for supplying multiple air stones or diffusers through a correctly sized distribution manifold.

The ET100 combines Charles Austen's Green Drive technology with a robust, compact and weather-resistant construction. With a power consumption of 105W, it provides a high-volume air supply for larger aeration installations and applications requiring regular or continuous operation.

Key features

• 100 L/min rated airflow: High-volume air delivery for larger aeration systems.

• 105W power consumption: Designed to provide substantial airflow for its output class.

• 0.10 bar rated pressure point: Published airflow specification for the ET100 model.

• Oil-free air supply: Linear diaphragm pump technology operates without oil lubrication.

• 18mm outlet connection: Compatible with suitable airline fittings and distribution systems.

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

• Multiple diffuser applications: Can supply several air stones or diffusers through a suitable manifold.

• Green Drive technology: Designed to provide an efficient air supply.

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

• Continuous or intermittent operation: Suitable for applications requiring regular or continuous aeration.

Suitable applications

Large pond and koi pond aeration

The Enviro ET100 provides a substantial air supply for larger garden ponds and koi installations. It can be connected to compatible pond diffusers to introduce air into the water and support oxygen transfer and circulation.

Its 100 L/min output makes it particularly useful where several aeration points are required. Select the number and type of diffusers according to pond depth, water volume, diffuser resistance and the aeration requirements of the system.

Hydroponics and deep water culture

The ET100 is suitable for larger hydroponic installations requiring a high-volume supply of air to nutrient solutions.

It can supply multiple air stones, air domes or compatible diffusers through a suitable distribution manifold. This makes it useful for larger deep water culture systems and installations operating several growing containers.

Aquaculture and fish-rearing systems

For suitable aquaculture installations, the ET100 can provide air to multiple aeration points. Correct diffuser selection and airflow distribution are important to ensure that the system receives the required aeration.

Wastewater aeration

The Charles Austen Enviro ET range is also used in wastewater applications where a reliable, low-pressure air supply is required. Aeration can support aerobic biological processes by supplying air to the treatment system.

Technical specifications

Installation and maintenance

Install the pump on a stable surface in a suitable location, following the manufacturer's instructions. Although the ET100 has weather-resistant construction, it should be positioned and protected appropriately for its operating environment.

Use compatible airline, fittings and diffusers. For installations with several aeration points, an air distribution manifold can divide the output between individual outlets.

Actual airflow at each diffuser depends on operating pressure, water depth, airline dimensions, diffuser resistance and the number of connected outlets. The rated 100 L/min figure should therefore be considered alongside the specified operating pressure, rather than treated as a guaranteed flow at every diffuser.

Charles Austen Enviro pumps are designed to be serviced, with replacement service kits available. Regular maintenance is important for pumps used in continuous-duty applications. GroAqua recommends servicing its ET pumps approximately every 18 months.

Why choose the Charles Austen Enviro ET100?

The ET100 is a strong option for pond owners, hydroponic growers and water-system operators who need more airflow than smaller aeration pumps can provide.

With its 100 L/min rated output, 105W power consumption, 18mm outlet and serviceable construction, it is particularly suited to larger installations and systems supplying multiple diffusers.

Choose the Charles Austen Enviro ET100 for high-volume aeration in large ponds, koi systems, hydroponics, aquaculture and other suitable low-pressure air applications.