Klargester Alpha Septic Tank

Kingspan Klargester Alpha tank

A traditional sewage disposal solution for domestic dwellings without access to mains drainage

Our Klargester Alpha septic tank range provides a reliable and economic solution for homes and small business premises with off mains drainage. Homeowners with septic tanks that discharge directly into surface water will need to replace or upgrade their drainage as soon as possible.

  • Suitable for individual domestic dwellings up to a large family house.
  • Made from composite GRP, our Klargester Alpha septic tank is strong and watertight.
  • Available in three sizes.

Please note: 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).

Important Update: Under very specific ground or site conditions, reed beds and converters can occasionally be used to comply with the  General Binding RulesKingspan Klargester's reed beds are low maintenance, easy to install, and Building Regulations-compliant. 

For more information call our team today on 0129 663 3000, or contact us using one of the alternate options below.


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Strong, light and watertight, the specialist design of the Alpha septic tank is ideal for easy installation and handling. A wide, flat shape guarantees minimal visual impact.

Key Features and Benefits

  • Light, watertight and chemically resistant
  • Suitable for homes with between 5-17 occupants
  • Robust, weather proof for guaranteed durability, giving you value for money 
  • Impact resistant - manufactured from composite GRP
  • Performance tested to EN - 12566 (Part 1) - high performance guaranteed
  • CE marked to comply with Construction Products Regulations (July 2013)
Basic septic tanks only retain solids and discharge effluent of low quality. Many authorities in the UK prohibit their use.

In all instances a sewage treatment system should be considered as the first option.

Septic tanks may be installed, subject to consent, in applications where:
  • Soil is of suitable porosity.
  • Installation complies with Building Regulations (Approved Document H).
  • The installation will not contaminate any ditch, stream or other watercourse.

Did you know?

If you have a septic tank that discharges directly to a surface water you will need to replace or upgrade your treatment system by January 1, 2020 – or when you sell your property if before this date.

Environment Agency — General Binding Rules

Technical Specification

No. People
Diameter (mm)
Height (mm)
Standard Inlet Invert (mm) Standard Outlet Invert (mm)
STS02810 2,800 5 2,075 2,599/3,099 1,000/1,500 1,050/1,550
STS03810 3,800 12 2,075 2,810/3,310 1,000/1,500 1,050/1,550
STS04610 4,600 17 2,084 2,984/3,484 1,000/1,500 1,050/1,550

Typical Applications for the Klargester Alpha 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

Service and Guarantee

Frequently asked questions

Septic tanks and their drainage fields can fail for several reasons. a. the tank itself may need emptying, you may have overloaded it (i.e. the tank may be too small to manage the quantities of waste water being produced) or, b. it should never have been installed there in the first place i.e. the ground may be unsuitable for filtering effluent from a septic tank which means technically the drainage field has failed. Unfortunately, you won’t know that until the evidence becomes apparent, which might be a foul smell, or solids appearing on your lawn.

At this point, your system will not have been working effectively for some time and will almost certainly have already caused local pollution.

Don’t forget that homeowners with septic tanks In England that discharge directly into surface water will need to replace or upgrade their drainage either when they sell their property as soon as possible. 

Septic Tank Converters cannot be used to demonstrate compliance with the General Binding Rules (Binding Rules 2020, DEFRA, January 2015).
All Kingspan Klargester products are supplied with a 12-month guarantee from date of delivery.
One of the most important factors in determining the choice of sewage treatment product is the site’s drainage properties. Both septic tanks and sewage treatment plants typically require a drainage field into which they discharge effluent. Testing the ground for its permeability is usually done by professional installer using a percolation test; the correct procedure is described in BS 6297:2007. Note: your property will need to be located on highly permeable ground if you want to install a septic tank otherwise the drainage field will fail. At least half the UK sits on a clay substrate, ruling this solution out and making a sewage treatment plant the only viable option.

The propensity of the site to flood and the height of the water table are also important considerations. Both H2 building regulations and BS 6297 state that the water table must be at least one metre below a septic tank outlet. In this instance, and if your property is in a flood risk area, you will need to install a sewage treatment plant.

Don’t forget that 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 (Binding Rules 2020, England).
Follow your system manufacturer’s instructions but always think very hard before putting anything down the toilet, or down the drain, if you have off-mains drainage.  

As a rule of thumb, use general waste to dispose of sanitary towels or tampons, disposable nappies, baby wipes, incontinence pads etc, rather than flush down the toilet. It’s also advisable to avoid chopping and changing to different brands of cleaner or washing detergent.

 A useful guide can be found at www.britishwater.co.uk/media/Download.aspx?MediaId=74.
If the red beacon on your system starts flashing check the panel to find out the fault code. Once you know the code check your user manual to find out what each code refers to. If you need any assistance understanding the fault code and how to resolve this please call the Kingspan Service Team on 0333 240 6868.

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