The Charles Austen Enviro ET120 is a high-capacity, oil-free air pump designed for large pond aeration systems, koi ponds, hydroponics, aquaculture and other applications requiring a substantial and dependable supply of air.

Delivering a rated airflow of 120 litres per minute at 0.12 bar, the ET120 is designed for installations where smaller air pumps cannot provide sufficient capacity. Its high-volume output makes it suitable for supplying multiple air stones or diffusers through a correctly sized air distribution manifold.

The ET120 combines Charles Austen's Green Drive technology with a robust, compact and weather-resistant construction. It is designed for applications requiring regular or continuous aeration and offers a serviceable alternative to smaller, lower-output air pumps.

Key features

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

• 125W power consumption: GroAqua's listed power rating; confirm against the supplied model revision.

• 0.12 bar rated pressure point: Current Charles Austen ET-series airflow specification.

• Oil-free air supply: Designed to provide air without oil lubrication.

• 18mm outlet connection: Suitable for compatible 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 energy-efficient air supply.

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

• Regular or continuous operation: Suitable for applications requiring ongoing aeration.

Suitable applications

Large pond and koi pond aeration

The Enviro ET120 provides a substantial air supply for large ponds and koi installations. Connect it to compatible pond diffusers to introduce air into the water and support oxygen transfer and circulation.

Its 120 L/min output makes it suitable for systems requiring several aeration points. Select the number and type of diffusers according to pond depth, water volume, diffuser resistance and the required aeration performance.

Hydroponics and deep water culture

The ET120 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 an appropriately sized distribution manifold. This makes it a useful option for commercial growing systems and installations operating multiple deep-water culture containers.

Aquaculture and fish-rearing systems

For suitable aquaculture installations, the ET120 can provide air to multiple aeration points. Correct diffuser selection and airflow distribution are important to ensure the system receives the required aeration.

Wastewater aeration

The Charles Austen Enviro range is designed for applications including wastewater aeration. Supplying air to a suitable treatment system can support aerobic biological processes by increasing oxygen availability.

Technical specifications

Installation and maintenance

Install the pump on a stable surface in a suitable location, following the manufacturer's instructions. Although the ET120 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 120 L/min figure should therefore be considered alongside the specified operating pressure, rather than treated as a guaranteed flow at every diffuser.

Charles Austen recommends servicing Enviro pumps at least every 18 months. Replacement service kits are available to support routine maintenance. This is particularly important for pumps used regularly or continuously.

Why choose the Charles Austen Enviro ET120?

The ET120 is a strong option for pond owners, hydroponic growers and water-system operators who need a high-volume air supply for larger installations.

With its 120 L/min rated airflow, 18mm outlet and serviceable construction, it is particularly suited to larger aeration systems and installations supplying multiple diffusers.

Choose the Charles Austen Enviro ET120 for high-volume aeration in large ponds, koi systems, hydroponics, aquaculture and other suitable low-pressure air applications.