Klargester Sigma Septic Tank


Klargester Sigma Septic Tank

The Klargester Sigma shallow dig septic tank is designed to reduce both installation time and cost. The range is available in various sizes suitable for properties with dig height restrictions. The advanced design of the Sigma Shallow Dig delivers a robust, impact resistant and durable tank.

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Homeowners with septic tanks that discharge directly into surface water will need to replace or upgrade their drainage either when they sell their property or before 1 January 2020 whichever is sooner. 
Homeowners are responsible for their choice, installation and maintenance of their wastewater system under a new code of practice introduced by the Environment Agency. They have a legal responsibility to minimise the impact of your sewage waste if they manage it within the bounds of your property e.g. with a septic tank or sewage treatment plant (Binding Rules 2020, DEFRA, January 2015).


Product Brochure:

Klargester Septic Tanks Brochure

Product Overview

Key Benefits
Technical information
Literature Downloads

Features and benefits

  • Fully compliant, tested and approved to EN12566 Part 1
  • CE marked to comply with Construction Products Regulations July 2013
  • Robust and simple to install for reduced on-site installation time
  • Reduced excavation costs, saving you money
  • Less soil disposal and less backfill material - kinder to the environment
  • Made from GRP - strong and durable for ultimate reliability
  • Light, watertight and chemically resistant
  • Robust, weather proof for guaranteed durability, giving you value for money
Technical Specification
Model Reference Capacity
Standard Inlet Invert (mm) Standard Outlet Invert (mm) Depth (mm)
STH028 2,800 5 1,225 2,995 500 530 1,627/1,587*
STH038 3,800 12 1,225 3895 500 530 1,617/1,577*
STH057 5,700 24 1,425 4,275 500 530 1,828/1,786*
STH071 7,150 34 1,920 3,225 500 530 2,290
STH091 9,150 47 1,920 3,960 500 530 2,290

* 110mm Diameter Pipework / 160mm Diameter Pipework

Useful Documents

Klargester Product Guide

Klargester Septic Tanks Brochure

Typical Applications for the Klargester Sigma Septic Tank range:

  • Single/Multiple Homes
  • Caravan & Camping sites
  • Golf Course Toilet/Washroom Facilities
  • Churches
  • Mobile Homes / Static caravans
  • Farms
  • Temporary work offices
  • Offices/Light Industrial Premises
  • Temporary Dwellings & Welfare Facilities

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