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Klargester BioFicient 4 500mm invert sewage treatment plant.
  • Klargester BioFicient 4 500mm invert sewage treatment plant.
  • Cross section of Klargester BioFicient models 3 to 6, including pump system.

15 Person Klargester BioFicient 4 Sewage Treatment Plant

10-14 working days
10-14 working days
Large Item
£4,081.35 ex. VAT
Free Delivery (Restrictions Apply)

Product Details


Model: BioFicient 4
: Up to 15 people
Diameter: 1920mm
Length: 3230mm
Depth to inlet invert level: 500/1000/1500mm
Depth to outlet invert level: 630/1130/1630mm
Fall between inlet & outlet: 130mm
Pipe & Fittings: 110mm
Effluent Quality
          BOD5: 20 mg/l
          NH4: 0.4 mg/l
          SS: 27 mg/l

This Klargester BioFicient 4 sewage treatment plant is specially designed to be a shallow dig, off-mains solution for up to 15 people. With its low profile cover and adjustable extension neck, it allows for a unobtrusive below ground installation that can save on-site installation time and costs. It also offers low running costs, high performance and low maintenance.

The BioFicient 4 model has 2 covers (1500mm & 900mm cover sizes) and is suitable for properties and applications of up to 15 inhabitants. Suitable for trafficked areas (structural advice needed depending on expected load - contact JDP for further details), and is manufactured from glass reinforced plastic (GRP).

Product Features at a Glance:

  • Minimal visual impact
  • Gravity or pumped discharge options available
  • High performance compressor
  • Low energy use at 189.8 kWh/year
  • One of the best ammonium reduction (0.4mg/l)
  • Can be installed in trafficked areas (structural advice required)
  • Easy installation
  • Shallow dig structure saves installation time and cost
  • Adjustable extension neck for deeper installations available upon request
  • Control panel included
  • BS EN 12566-2 certified
  • CE marked 

Choose between Gravity discharge or Pumped discharge types. The IPS (integral pump system) model of the BioFicient 4 sewage treatment plant allows treated water to be pumped to the soakaway area or watercourse, which is ideal for situations where they may be some distance away from the outlet pipe (where the treatment plant releases treated water).

Typical Applications:

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

Please Note:
 All images shown are used for illustration purposes only and may differ from the actual product supplied.


Frequently Asked Questions

Q: How does the Klargester BioFicient 4 work?
A: In the Klargester BioFicient 4, 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.

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

Q: How easy is the Klargester BioFicient 4 to maintain?
A: The Klargester BioFicient 4 sewage treatment plant is designed for low-cost and easy maintenance.

  • Under normal usage your Klargester BioFicient will require periodic emptying.
  • Klargester offers a full post installation inspection and after sales service.
10-14 working days
13-24 Persons
Install Type:
Product Type:
Sewage Treatment Plant