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Charles Austen ET300A Air Blower with Built in Alarm 300 l/pm

£489.00

(exc VAT)
£489.00

(exc VAT)
Quantity

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Keep your sewage treatment system or pond operating efficiently with the Charles Austen ET Enviro 300 Linear Diaphragm Air Pump. Designed to deliver a reliable, clean, and oil-free air supply, this high-performance air pump provides an impressive 300 litres per minute airflow at 0.20 Bar, making it ideal for large domestic and commercial wastewater treatment systems, septic tanks, and pond aeration applications.

Built with a durable weatherproof housing, the ET Enviro 300 is suitable for both indoor and outdoor installation. Its integrated alarm system offers added peace of mind by detecting low airline pressure, alerting users through a bright LED warning light and high-pitched buzzer to help prevent system issues before they become costly repairs.

Manufactured for long-lasting performance, this robust diaphragm pump is compatible with servicing kits, helping extend operational life and maintain peak efficiency over time.


Key Features

  • Delivers up to 300 litres per minute (LPM) airflow
  • Provides a clean, oil-free air source
  • Built-in low-pressure alarm for enhanced system protection
  • Bright LED warning light and audible buzzer alert system
  • Optional 230V output wire for connection to alarm panels or warning beacons
  • Weatherproof construction suitable for indoor and outdoor use
  • Includes rubber elbow connector for straightforward installation
  • Ideal for sewage treatment plants, septic systems, and pond aeration
  • Service kit compatible for extended pump lifespan and reduced maintenance costs

 

Ideal Applications

  • Sewage treatment plants
  • Septic tank aeration systems
  • Wastewater treatment systems
  • Commercial and domestic treatment plants
  • Large garden and koi ponds
  • Aquaculture and fish farming

 

Technical Specifications

  • Model: ET300
  • Performance: 300 LPM @ 0.20 Bar
  • Power Consumption: 275W
  • Connector Size: 26 mm
  • Length: 349 mm
  • Width: 231 mm
  • Height: 219 mm
  • Weight: 18.0 kg

 

Why Choose the Charles Austen ET Enviro 300?

The ET Enviro 300 combines powerful airflow, dependable performance, and advanced safety monitoring in one robust unit. Whether you're maintaining a sewage treatment plant or improving oxygen levels in a large pond, this reliable linear diaphragm air pump delivers efficient, low-maintenance operation year after year.

Warranty information

Charles Austen recommends that all air pumps and systems are serviced annually. Although the air pump carries a 2-year manufacturer's warranty, diaphragms, valves and filters are consumable parts that naturally wear over time and should be replaced during routine servicing to maintain warranty compliance and ensure reliable operation.

 

Product images are for illustration purposes only and may vary slightly from the actual pump supplied.

SKU: CA-ET300A

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FAQs

Got questions? We’ve got the answer...

When will my order be dispatched?

Spare Parts Shipping
We ship in-stock spare parts the same day if ordered before 3pm. These orders are sent with DPD as standard and will be shipped on a Tracked Next-Day service.


Tanks & Supplier-Shipped Items

Tanks and certain spare parts are shipped directly from our suppliers. We aim to submit supplier orders to the supplier on the same day your order is placed to ensure prompt processing. 

How much is delivery?

Delivery costs vary depending on the type of product:

 

In-stock Spare Parts: £8.20 - shipped via DPD on a Tracked Next-Day service.
Supplier-shipped Spare Parts: £15 - dispatched directly from the supplier.
Tanks and Sewage Treatment Systems: Free Delivery to most mainland UK postcodes.

 

All delivery charges are calculated accurately at checkout.

I need help with placing my order.

No problem! Here are a few ways we can assist you:

Live Chat: Click the chat icon on the bottom right of the page to speak with our team instantly.
Call Us: Reach us at 01388 537050 during business hours for quick support.
Email: Send your query to sales@direct-drainage.co.uk, and we’ll respond promptly.

Do you stock all tanks and sewage treatment systems?

We do not stock tanks and treatment systems as standard. These are supplied directly from the manufacturer. The lead times of these systems will vary. If you need an accurate delivery date, please contact us on 01388 537050.

Are your prices inclusive of VAT?

It is important to note that all prices listed on our website exclude VAT. VAT will be calculated at checkout. 

I've found the same item somewhere cheaper, can you match the price?

We always aim to offer competitive pricing. If you've found the same item cheaper elsewhere, let us know — we'll do everything we can to match or even beat the price.

 

Contact us directly on 01388 537050 or drop us an email at sales@direct-drainage.co.uk.