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ClearFox Nature [non-electric]

4.91 (22 reviews)

The only non electric system on the market that never requires replacement parts.

  • Compliant with all European standards – including UK2020 septic tank upgrade regulations and SR66 regulations in Ireland
  • High effluent quality for direct discharges
  • Sustainable home sewage treatment
  • Zero energy consumption
  • Odour free
  • Noise free (no mechanical parts)
  • Suitable for new builds or septic tank upgrades
  • Shallow dig tank with no concrete backfill
  • EN12566-7 and  EN12566-3 certified
  • British Water approved
  • Rapid nationwide delivery
  • Contact us for information, advice or a free quotation


ClearFox Nature Non Electric Home Sewage Treatment System

The Clearfox nature non-electric sewage system

The ClearFox Nature by Biocell Water is an innovative non electric domestic sewage treatment plant that uses zero electricity to treat wastewater. It is the only sustainable domestic sewage system on the market that will never require replacement parts or media throughout its lifetime. The modular (expandable) design of the ClearFox Nature means that it is suitable for both small scale sewage treatment applications and large scale wastewater treatment applications.

This eco friendly treatment system is both EN12566-3 certified and British Water approved.  For new builds, a complete ClearFox sewage system with a primary tank is the ideal low cost wastewater treatment solution for the environmentally conscious. Alternatively, we can install the ClearFox Nature treatment tank as an upgrade to an existing septic tank if necessary. It features a gravity outlet and is suitable for installation in all soil conditions.

Sustainable Wastewater Treatment for Homeowners and Builders

For homeowners, the yearly savings are significant with no electricity costs, no media or parts and no specialist maintenance requirements. This odour free home sewage system is so effective and reliable that it cannot breakdown or fail. Plus, it is the quietest domestic wastewater treatment plant on the market.

Among the many good reasons an installer or a builder would choose a ClearFox Nature non electric domestic wastewater treatment system is our trade discount. The installation process is quick and easy without any need to connect the tank to a power supply. It’s also a shallow dig tank which is suitable for installation in all soil conditions. Not only that, it’s a single piece watertight tank made with reinforced with HDPE that does not require any concrete backfill. The low purchase price and trouble free set up is ideal for budgeting a new build.

Upgrading a Septic Tank to Zero Energy Wastewater Treatment

The ClearFox Nature is a perfect solution for upgrading an existing septic tank. This is because we install the bioreactor tank after an existing septic tank. It’s quick and easy to install, without the need to bring a power supply to the tank location. We simply connect the outlet of the existing septic tank into the ClearFox Nature reactor tank, and we then connect the outlet of the ClearFox Nature to an existing soakaway or stream/watercourse – easy! Furthermore, by adding the bioreactor tank after your septic tank you have a system that is totally compliant with EN12566-7 – the EPA standard for domestic sewage treatment systems.

Clearfox Nature Zero Electricity Treatment Process

Primary Treatment

Firstly, raw sewage enters the first tank which is the primary chamber. Here, any large solids settle out of the wastewater. These solids settle into the bottom of the primary tank to form settled sludge. This sludge then settles and compacts, allowing for long desludging intervals.

Following that, any fats, oils, grease or scum floats on the top of the water column in the primary chamber. This material forms a scum layer. The primary tank is an anoxic, passive treatment step. As all floating material and all solids remain in the primary chamber, the wastewater that flows forward is cleaned in this primary treatment stage.

The Bioreactor

Once primary treatment is complete, the primary cleaned wastewater flows by gravity into the reactor chamber. A tipping plate spreads the effluent evenly over the entire media surface. The plastic media in the bioreactor has a very high surface area. This surface area is colonised by naturally occurring bacteria. These bacteria feed on the nutrients and organic material in the incoming wastewater, cleaning it to a very high standard.


Most electric systems use small electrical air compressors to aerate the wastewater and to provide the bacteria that complete the cleaning with oxygen. However, the Clearfox Nature uses natural ventilation via a small 1m high vent stack to draw fresh air into the tank. This means the system does not need any electricity. So you have a process driven by naturally occurring bacteria, using natural ventilation for the aeration process. This makes the Clearfox Nature a totally sustainable method of wastewater treatment. Saving you money on operational costs every day.

How to Buy A ClearFox Nature Non Electric Home Sewage System

If you would like to upgrade your septic tank and produce cleaner, better quality effluent then the Clearfox Nature is an ideal solution. Once we know about your project and site requirements we can give an instant quotation. We are always on hand to answer any of your questions about non electric wastewater treatment and give free expert advice.

For additional peace of mind, we provide a nationwide customer support service and for long term care we offer value for money maintenance packages to keep your new home sewage treatment system in top working order.

Our experienced technical sales team are here to help guide you through the process and ask the necessary questions. Simply get in touch using the contact form or give us a call. We are happy to provide you with a free quotation or to provide extra information about any of our wastewater treatment plants and products. We look forward to hearing from you.


Additional information


4 to 48 person models. Modular system for larger developments.

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

22 reviews for ClearFox Nature [non-electric]

  1. Martina

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

  2. Quintan Dolan

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

  3. Shivambika singh

    How do I get this installed in India?

    • James Clarke

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

  4. sara reiss

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

  5. Francis Ryan

    Very happy with the product and service. Many thanks.

  6. Fran Kellegher

    Simply the best – but comes at a price.

  7. 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.

  8. 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.

  9. Alan Bizworth

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

  10. 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.

  11. Paul Kennedy

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

  12. Mr Eco Warrior!

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

  13. Hugh Breen

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

  14. 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.

  15. A. Saunders

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

  16. Fintan P

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

  17. John Barnes

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

  18. 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.

  19. Southern Glamping

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

  20. 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.

  21. 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.

  22. 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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