ClearFox Nature [non-electric]

(23 customer reviews)

The only non electric treatment plant that will not require replacement parts or media throughout its lifetime.*

*Certified by EN-12566-3, SR66, British Water, UK2020 Septic Tank Upgrade Regulations, CE marked

Available in 4/8/16/24/32 person capacity with gravity outlet or 4-8 person biomodule only

Riser kits not needed for normal installations. Telescopic riser extendable up to 1000mm available for deep installations.

SKU: CFN Category:


ClearFox Nature Non Electric Domestic Sewage Treatment Plant

The ClearFox Nature is the only non electric domestic sewage treatment plant on the market that never requires any replacement parts or media throughout its lifetime. It is a sustainable and ecofriendly treatment plant, using only natural ventilation and naturally occurring bacteria to effectively process domestic wastewater. For homeowners, the yearly savings are significant with no electricity costs, no media or parts and no specialist maintenance requirements.

The modular (expandable) design of the ClearFox Nature means that it is suitable for both domestic and commercial applications. It features a gravity outlet and is suitable for installation in most soil conditions. The installation process is quick and easy without the need to connect the tank to a power supply. The ClearFox Nature features a flat base, single piece watertight tank made with reinforced with HDPE that does not require concrete backfill on most sites.

The ClearFox Nature holds a CE declaration independent test certificate, meets EN12566-3 and SR66 standards and is approved by British Water. We can therefore guarantee the quality of this non electric domestic sewage treatment plant.

Benefits of Non-Electric

  • Uses natural ventilation and naturally occurring bacteria to process domestic wastewater to excellent standards.
  • No daily operational costs, the ClearFox Nature does not require electricity to operate.
  • No wearing parts or media inside for trouble free operation and maintenance.
  • Significant yearly savings for end-users
  • Modular (expandable) design suitable for both domestic and commercial applications
  • Fast installation with no connection to power supply
  • Steel reinforced flat base tank does not require concrete backfill on most sites
  • No noise, no odour

Why buy from us?

We offer a nationwide customer support service to all end users. For long term care and maintenance, we offer value for money maintenance packages. We guarantee the quality of our products with independent testing and CE approved parts.


How does the ClearFox Nature domestic sewage treatment plant work?

  1. Raw domestic sewage enters the first tank or primary chamber through the inlet pipe. Large solids settle and compact at the bottom of the chamber. Any fat, oil or grease in the wastewater floats to the top of the water column to form a scum layer. All floating material and solids remain in the primary chamber, this allows for longer desludging intervals. This completes the primary treatment.
  2. The primary cleaned wastewater flows by gravity into the second tank, the reactor chamber. The plastic media in the bioreactor has a very high surface area. A tipping plate spreads the effluent evenly over the entire media surface. Naturally occurring bacteria colonise the media and feed on the nutrients and organic material in the incoming wastewater. It is the action of the bacteria that cleans the domestic wastewater to a very high standard before it exits the treatment plant.

How does the ClearFox Nature operate without electricity?

Most domestic wastewater treatment plants use small air compressors to aerate the wastewater in order to provide the bacteria with sufficient oxygen. However, the ClearFox Nature uses natural ventilation through a 1m high vent stack to draw fresh air into the tank. This does not require electricity.

Can I upgrade my domestic septic tank with the ClearFox Nature?

The ClearFox Nature bioreactor can be installed after an existing septic tank in order to upgrade it to comply with EN12566-7  the EPA standard for domestic sewage treatment systems. It is a simple installtion without the need to bring a power supply to the tank location. The outlet of the existing septic tank connects into the ClearFox Nature bioreactor tank. The outlet of the ClearFox Nature bioreactor tank then connects to the existing soakaway or stream/watercourse.

What happens to the sludge?

Sludge accumulates inside the primary chamber of the ClearFox Nature which has a total capacity of 3,500l. Like all treatment plants, the sludge should be removed on a regular basis by a professional sewage disposal company who pump it out and take it away for disposal. This is the most economical way to tackle sludge in domestic wastewater treatment systems.

Get in touch:

  • Please add any additional information about your requirements here.

Additional information

Outlet Type


Inlet Pipe Size

110mm / 4"

Outlet Pipe Size

110mm / 4"
Note: outlet at base of treatment tank

Manhole Extensions Available


Manhole size

Ø 680mm

Tank Material

Reinforced HDPE

Electrical Supply

None required

Electrical Consumption



EN12566-3, DIBT, British Water Approved

CE Marked


Suitable For Below Ground Installation

Yes. Also suitable for above ground installation.

Suitable for Upgrades

Yes – simply place biomodule tank after existing septic tank

Suitable for New Builds

Yes – and can be installed in place of any other system

23 reviews for ClearFox Nature [non-electric]

  1. Michael Walker

    Hello. I called you a few months ago and you told me you did not service the United States. Can you give me a price quote just for the system components and I will be responsible for finding someone stateside to install it. My property is adjacent to wetlands and has lots of clay. I do not have many options . I am sure you system will work perfectly above ground.

  2. Martina

    The system is very discreet, it goes unnoticed in our garden.

  3. Quintan Dolan

    Recommended to us by our neighbour who was very happy with the overall service as were we.

  4. Shivambika singh

    How do I get this installed in India?

    • James Clarke

      Hi Shivambika, please send your requirements to for a quotation.

  5. sara reiss

    we replaced our old septic tank with one of these and have to say it’s given me peace of mind!

  6. Francis Ryan

    Very happy with the product and service. Many thanks.

  7. Fran Kellegher

    Simply the best – but comes at a price.

  8. Todd Branner

    Purchased 5 of these for a cluster of houses I am building. Great product. Not cheap but no need to bring a power supply to the unit or do electrical works, etc. I just want total security and trouble free operation.

  9. Paul Simpson

    I build high end homes. This is my third unit installed. A very high quality product and they are guaranteed to be trouble free. A no brainer if budget allows you to put one in.

  10. Alan Bizworth

    Got an 8 person unit. Not cheap but very very satisfied with it.

  11. Alan Locke

    A bit more expensive than a regular system, but I really wanted a non electric system. When you compare the nature unit to the other couple of non electric plants on the market it is really a simple choice.

  12. Paul Kennedy

    Installed one for my holiday home. Wont be using energy in my absence. Very pleased with the end result.

  13. Mr Eco Warrior!

    My name should describe the type of person I am. This was the ONLY option for me.

  14. Hugh Breen

    Just what I have been looking for. 5+++

  15. John Falton

    Installed for an upgrade at my house. There was no electricity in the only available location for the tank, and bringing a power supply to the tank would have cost a fortune. So while I didnt have much choice in going for non electric – I am ultimately happy with the service I got.

  16. A. Saunders

    Recommended by my architect. I am pleased with the choice I made.

  17. Fintan P

    Not cheap but I wanted the best. A1 unit. If I ever build again I will get my builder to install another.

  18. John Barnes

    Super unit. Installed it myself over a weekend to replace a very very dodgy existing septic tank.

  19. Mark Torpey

    My installer loved the unit. Only issue is we needed manhole extensions as was a deep installation and there was a small extra charge for them. Not really a complaint and was more a mistake by my installer really. Would recommend the nature unit for anyone who wants the best.

  20. Southern Glamping

    Installed a 32 pop system for my glamping site. Was the logical choice. Very happy.

  21. Martina Lloyd

    Installed at our holiday home. Excellent choice as it is not guzzling electricity while we are not there [like other systems] and we have no concerns over arriving to the house after being away for 3 months and something being broken as no moving parts.

  22. Peter – Cornwall

    Not building a passive house – but like the idea of non electric. Nice slope on my site so was a perfect fit. Installed now a few weeks and its working like a dream. You would not know there was a system installed as totally silent and no smell.

  23. Simon Rowland

    Not cheap but I wanted non electric. Very few options. I did my research and realised the all the other the non electric plants need replacement parts and good bit of maintenance. So in the end it was a simple decision going for the clear fox nature.

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