Sewage Treatment Plant Products

ClearFox Nature [non-electric]

Rated 4.94 out of 5 based on 17 customer ratings
(17 customer reviews)

High effluent quality for direct discharges to streams. No energy consumption. No replacement parts. Shallow dig tank with no concrete backfill required. Nationwide delivery. Trade prices. Odour free and no noise as no mechanical parts. Suitable for new builds or septic tank upgrades. Instant quote.


A totally non-electric sewage treatment plant. The only non-electric plant on the market that never requires any replacement parts or media. EN12566-3 certified and British Water approved. Modular system for small domestic and larger applications. The treatment tank can be installed after an existing septic tank as an upgrade.  A complete system with a primary tank is perfect for new builds. Gravity outlet. Installation in all soil conditions.

  • No electricity costs
  • No replacement parts
  • High effluent quality for direct discharges
  • Single piece watertight tanks
  • Reinforced HDPE tanks do not need a concrete backfill
  • Shallow dig tank
  • Approved for installation in place of any other system
  • Nationwide rapid delivery
  • Long desludging intervals

A clearfox non-electric sewage plant

Homeowner: Why buy a ClearFox Nature

  • Save money every year as no electricity costs
  • Save money every year as no replacement parts ever needed
  • Save money every year as no specialist maintenance ever needed
  • No odour
  • No noise – the quietest system on the market
  • Total peace of mind – the system cannot break down or fail
  • Nationwide customer support and service teams
  • Reliable and robust – systems installed all over the world

Installer/Builder: Why buy a Biocell QuickOne+

  • Trade discounts
  • High-density tank reinforced with stainless steel – so no concrete ever required
  • Risers for deep installation
  • Shallow dig tank – can be installed with a mini digger
  • Single piece high-density tanks. Guaranteed to be watertight
  • Plug and play complete unit – no separate housings for air blowers
  • No need to bring a power supply to the tank
  • Flat base for simple installation – not curved or cone-shaped tanks that are difficult to backfill
  • 2-day nationwide delivery

Septic Tank Upgrades

The ClearFox Nature is a perfect solution for upgrading an existing septic tank. The Bioreactor tank can be installed after an existing septic tank. The outlet of the existing septic tank is simply connected into the ClearFox Nature reactor tank, and the outlet of the ClearFox Nature is then connected to an existing soakaway or stream/watercourse.

If you want to upgrade your septic tank to produce a better quality effluent, the Clearfox Nature is an ideal solution. Simple and easy to install, without the need to bring a power supply to the tank location. Adding the bioreactor tank after your septic tank gives you a system that is totally compliant with EN12566-7.

The Clearfox nature non-electric sewage system

How Does the Clearfox Nature Non Electric Sewage Treatment Plant Work?

Primary Treatment

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 settles and compacts, allowing for long desludging intervals.

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 are retained in the primary chamber, the wastewater that flows forward is cleaned in this primary treatment stage.

The Bioreactor

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.


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.

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

17 reviews for ClearFox Nature [non-electric]

  1. Rated 5 out of 5

    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.

  2. Rated 5 out of 5

    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.

  3. Rated 5 out of 5

    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.

  4. Rated 5 out of 5

    Southern Glamping

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

  5. Rated 4 out of 5

    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.

  6. Rated 5 out of 5

    John Barnes

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

  7. Rated 5 out of 5

    Fintan P

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

  8. Rated 5 out of 5

    A. Saunders

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

  9. Rated 5 out of 5

    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.

  10. Rated 5 out of 5

    Hugh Breen

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

  11. Rated 5 out of 5

    Mr Eco Warrior!

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

  12. Rated 5 out of 5

    Paul Kennedy

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

  13. Rated 5 out of 5

    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.

  14. Rated 5 out of 5

    Alan Bizworth

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

  15. Rated 5 out of 5

    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.

  16. Rated 5 out of 5

    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.

  17. Rated 5 out of 5

    Fran Kellegher

    Simply the best – but comes at a price.

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