Earn Rewards on Every Order - Unlock Your Discounts Now!
00
HRS
00
MIN
00
SEC

Order before 3PM for Next Working Day Delivery

On In-stock Spare Parts
Gray and black rectangular pump with a cylindrical component on a white background
Technical datasheet for Charles Austen Pumps Ltd with pump specifications and graphs.
Technical datasheet for Charles Austen Pumps Ltd with pump specifications and graphs.
Charles Austen ET Series Service Instructions
Charles Austen ET Series Service Instructions
Charles Austen ET Series Service Instructions

Over 17,000+ Happy Customers

Charles Austen ET500 Air Blower 500 l/pm

£749.00

(exc VAT)
£749.00

(exc VAT)
Quantity
VERY POPULAR! ONLY 0 LEFT IN STOCK
OUT OF STOCK
Restocking soon! PREORDER NOW
HURRY! BUY NOW

OUT OF STOCK

Secure Payment - Multiple Payment Gateways

The Charles Austen ET500 Air Pump is a powerful, energy-efficient linear diaphragm air pump designed to deliver high airflow at low pressure for wastewater treatment, pond aeration, aquatic oxygenation, and commercial water management systems. Producing up to 500 litres per minute (LPM), the ET500 helps maintain healthy oxygen levels, supporting aerobic bacteria in the effective breakdown of waste.

Built with Charles Austen's advanced Green Drive Technology, the ET500 combines outstanding performance with low energy consumption, making it an ideal choice for continuous-duty applications. Its weatherproof construction allows for reliable indoor and outdoor installation in demanding environments.

 

Key Features

  • Delivers up to 500 LPM airflow at 0.20 Bar
  • Clean, oil-free air supply
  • Energy-efficient Green Drive Technology
  • Robust, compact and weatherproof design
  • Supplied complete with flex and plug
  • Rubber elbow included for easy installation
  • Whisper-quiet operation from as low as 35dB
  • Suitable for continuous or intermittent operation
  • Specially formulated diaphragms for extended service life
  • Easy to maintain with competitively priced service kits

 

Benefits

  • Improves oxygen transfer in wastewater treatment systems
  • Supports aerobic bacteria for more efficient waste decomposition
  • Low running costs through energy-efficient motor technology
  • Reliable long-term operation in challenging environments
  • Quiet performance suitable for residential and commercial installations
  • Easy servicing helps maximise pump lifespan

 

Suitable For

  • Sewage Treatment Plants (STPs)
  • Wastewater Treatment Systems
  • Septic Tank Aeration
  • Pond Aeration
  • Aquatic Oxygenation
  • Fish Farms and Aquaculture
  • Spas and Whirlpool Systems
  • Water Features and Ornamental Ponds
  • Medical and Laboratory Air Supply Applications

 

Technical Specification

Model: ET500
Performance: 500 LPM @ 0.20 Bar
Power Consumption: 460W
Connector Size: 27mm
Length: 340mm
Width: 168mm
Height: 247mm
Weight: 18.0kg

 

Why Choose the Charles Austen ET500?

The Charles Austen ET500 offers exceptional airflow, reliability, and energy efficiency for demanding aeration applications. Whether you're operating a sewage treatment plant, aquaculture system, spa, or water feature, the ET500 delivers dependable oil-free airflow with low operating costs and minimal maintenance requirements.

 

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.

Images are for illustration purposes only and may vary slightly from the actual product.

SKU: BLOBLOWCHA019

Agricultural Tanks Agricultural Tanks Agricultural Tanks

Why Buy Spare Parts from Direct Drainage?

Next-Day Spare Parts

Order in-stock spare parts before 3pm for next-day delivery.

Best Price Guarantee 

Found our product cheaper somewhere else? We will match it!

Authorised Supplier

Over 20 years experience as an official authorised retailer.

Trusted Support

Not sure which part you need? Call our team on 01388 537050.
Agricultural Tanks

YOU MAY ALSO LIKE

CUSTOMER REVIEWS

Rated 4.8/5 by Direct Drainage Customers

Based on over 600 verified reviews

VERIFIED REVIEW

Very helpful from the start to the finish

Items were despatched quickly and arrived the next day. Would recommend.

Title

North Hayne Farm Cottages | 26 June 2026

VERIFIED REVIEW

Cheapest price I could find for the pump

Cheapest price I could find for the pump and delivery the next day what more could you want.

Title

Sam Jukes | 5 November 2025

VERIFIED REVIEW

Great service!

I ordered a septic tank it was delivered within a week and the delivery driver left it in the exact right place and time. Would definitely use this company again, thanks so much.

Title

Eve Harland | December 2025

OFFICIAL SUPPLIERS OF:

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.