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
Charles Austen ET30/ET40 Filter
Charles Austen ET80AO Linear Air Pump

Over 17,000+ Happy Customers

Charles Austen ET30/ET40 Air Blower Filter

£4.50

(exc VAT)
£4.50

(exc VAT)
Quantity
VERY POPULAR! ONLY 140 LEFT IN STOCK
OUT OF STOCK
Restocking soon! PREORDER NOW
HURRY! BUY NOW

VERY POPULAR! ONLY 140 LEFT IN STOCK

Secure Payment - Multiple Payment Gateways

Keep your Charles Austen ET30 and ET40 Air Pumps operating efficiently with this genuine replacement inlet filter. Designed specifically for ET Series linear diaphragm air pumps, this high-quality filter helps prevent dust, dirt, and airborne contaminants from entering the pump, protecting internal components and maintaining optimal airflow.

Regular filter maintenance is essential for maintaining pump performance and extending the lifespan of your air blower. A dirty or blocked filter can reduce airflow by up to 30%, decreasing aeration efficiency and potentially causing the pump to overheat. Routine cleaning and annual replacement help ensure reliable operation and maximum performance.

Ideal for septic tank aeration systems, sewage treatment plants, wastewater treatment systems, ponds, and aquatic applications.


Key Features

  • Genuine replacement inlet filter for Charles Austen air pumps

  • Compatible with ET30 and ET40 models

  • Maintains optimal airflow and aeration performance
  • Protects internal components from dust and debris
  • Helps reduce the risk of overheating and premature wear
  • Easy to remove, clean, and replace
  • Essential for routine servicing and preventative maintenance
  • Supports long-term pump efficiency and reliability


Maintenance Recommendations

  • Wash the filter every 6 months
  • Replace the filter every 12 months
  • Helps maintain peak airflow and pump performance
  • Dirty filters can reduce airflow by up to 30%
  • Minimises strain on the pump and motor assembly
  • Helps prevent overheating and costly repairs


Suitable for:

  • Charles Austen ET30 Air Pump
  • Charles Austen ET40 Air Pump

 

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.

Please note: Product images are for illustration purposes only and may vary slightly from the actual product supplied.

SKU: BLOFILTCHA001

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.