BioFicient® Domestic Sewage Treatment Plant

An affordable shallow dig sewage treatment plant, with a low profile cover.

Bioficient_ Cut Away
Our Klargester BioFicient® range has been specially designed for shallow dig applications, allowing for efficient and economical on-site installation. You’ll also find that the Bioficient® is high performing and easy to maintain. For the latest wastewater treatment technology, you don’t need to look further.
  • This BioFicient® model includes a low-profile cover and adjustable extension neck, enabling unobtrusive below ground installation.
  • Suitable for homes of up to 30 people, or applications such as small offices, barn conversions, farms and light industrial premises.

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Features and Benefits
Technical Information
Literature downloads

The Klargester BioFicient is a highly economical and reliable solution for your sewage treatment needs. With low running costs, the Klargester BioFicient is easy to maintain – with the high performance you would expect from a Klargester product.

  • Shallow dig
  • New high performance compressor
  • Robust and damage resistant due to MDPE construction
  • Minimal visual impact
  • Excellent ammonia reduction (0.4mg/l)
  • Installation in trafficked areas (structural advice required)
  • Saving on-site installation time and costs
  • EN 12566-3 tested and approved
  • CE-marked
  • NEW! Integral pump discharge option is now available for the Bioficient 1-4 model
  • S.R.66:2015 compliant

Klargester Product Guide

Bioficient PIA certificate

How the Klargester BioFicient works

The moving aerated media process used is a compact development of the traditional biological process and provides a more effective and complete means of reducing the loads.

1. Raw sewage gravitates to the unit where it is received in the primary settlement zone. Here, gross solids and other social debris settle to the bottom of the tank where they remain until the tank requires desludging.  Settled sewage is displaced from primary zone and enters the first of : two sequential moving aerated media reactors.

2. Media and liquid circulation in each zone is achieved through the use of a compressor and diffuser, which introduces fresh air into each compartment. The liquor is constantly re-circulated and contacts the moving media and as it does so, it is purified by the microorganisms (biomass) growing on the surface of the media and within the moving liquor. Excess growth of biomass is shed as solid particles into the liquor.

3. The final settlement tank is where humus solids settle to form sludge.  At preset intervals, portions of the sludge and liquor are returned to the primary tank for additional treatment.

4. Final effluent is displaced from the final settlement tank. With regulator approval, it is suitable for discharge to a watercourse or drainage field.


Model BioFicient 1 BioFicient 2 BioFicient 3 BioFicient 4 BioFicient 5 BioFicient 6
PE 6 8 10 15 20 30
Overall Diameter (mm) 1540 1420 1420 1920 1920 1920
Length (mm) 2500 3760 3760 3230 4390 6220
Invert Inlet (mm) 500-810/500-810* 500/1000/1500 500/1000/1500 500/1000/1500 500/1000/1500 500/1000/1500
Outlet Invert (mm) 600-910/555-865* 600/1100/1600 600/1100/1600 630/1130/1630 630/1130/1630 630/1130/1630
Blower Ratings 50W 95W 95W 115W 180W 225W
Cover Sizes 700 900 900 1500/900 1500/900 1500/900 + 600**

Optional inlet depth down to 1800mm
*BioFicient 1 IPS model only
**BioFicient 6 has two shafts

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Typical applications:
  • Single & Multiple Homes
  • Barn Conversion
  • Small Office Development
  • Stable Yard Toilet
  • Farms
  • Offices & Light Industrial Premises


Useful documents

Klargester Product Guide

Bioficient PIA certificate

SR66:2015 Compliant

Klargester Guide to Selfbuild