Bio-Pure Low Profile Septic Tanks

available in 2 sizes and we can manufacture bespoke tanks if required

3200 Litre (6 persons)

Height – 1300 mm
Length – 2230 mm
Width – 1400 mm
Depth below invert level – 1350 mm

4800 Litre (12 persons)

Height – 1300 mm
Length – 3300 mm
width – 1400 mm
Depth below invert level – 1350 mm

What are septic tanks?

Septic Tanks are the old fashioned way of dealing with sewage. It stores solid waste and offers very little treatment to the liquid waste it accepts. 

A septic tank is often made from GRP or Polyethylene and it has a foul drainage pipe connected to the inlet and a drainage pipe connected to the outlet. 

From there it discharges into a soakaway or into a treatment plant where the effluent can be treated further. There are often two or three chambers inside the septic tank separated by dividing walls allowing the sewage to flow through.

The Bio-Pure Low Profile Septic Tanks feature a filtered outlet. The image shown is of the 3200 Litre Septic Tank.

**please note that the depth below invert is based on a traditional septic tank.

Septic Tank

How do Septic Tanks Work?

Sewage enters the primary chamber of the septic tank, where solids settle at the bottom via gravity. The settled solids are anaerobically treated reducing the overall volume within the tank. 

The liquid waste then flows through the dividing wall into the second chamber where further settlement takes place. The liquid is then discharged into a soakaway or if necessary, lifted to a sewage treatment system for further treatment before being discharged.

Waste will always remain in a septic tank despite the best efforts of anaerobic digestion as it offers very little treatment to settled sludge. The septic tank will eventually have to be emptied so as to prevent the sewage from overflowing into the drainage field (soakaway etc). 

This is not only very bad for the environment, but it will decrease the porosity of the soil and often clog up the soak way causing the raw sewage to back up and result in costly repairs being needed.

How often will I have to empty my septic tank?

This is determined purely by the volume of the tank in relation to the amount of solids going into it, the surface area contact and also the ambient temperature, as anaerobic treatment is more effective at a higher temperature. 

The emptying interval can vary greatly and often depends on usage, the diligence of the owner and also the different characteristics of each system. 

Some septic tanks need de-sludging every 4-6 months while others can go for over 12 months before requiring emptying. 

There is no set period of time determining how often a septic tank should be emptied.

drain cleaning

The Bio-Pure Low Profile Septic Tanks

As well as manufacturing, installing and servicing the Bio-Pure Sewage Treatment System, we also manufacture a Low Profile Septic Tanks with a filtered outlet.
This is designed to significantly reduce installation costs and increase effluent quality.
This is achieved by a larger service area contact which increases oxidisation, thus allowing the waste to broken down more efficiently than with a traditional onion shaped septic tank, resulting in majorly reduced pollution.
The Low Profile Septic Tank also features a filtered outlet which prevents any suspended solids from entering the soakaway. Also the Low Profile Septic Tank doesn’t require the same depth as a traditional onion shaped tank, so installation costs are lowered.

  • Fully designed and manufactured in accordance with BS EN12566-1
  • Concrete is only required for installation in a high water table or if a greater depth is required
  • We offer an adaptable invert level to cater for any individual needs
  • All risers and manholes are included
  • Typical emptying period of 12-18 months
  • 7-10 days lead time, but can be dispatched sooner if required


The Low Profile Septic Tank is available in 2 sizes and we can manufacture bespoke tanks if required. It can also be used as a “trash tank” to sit in front of a treatment system on a larger domestic, or commercial site.


What is 2020?

Discharges from septic tanks directly to a surface water are not allowed under the general binding rules.
If you have a septic tank that discharges directly to a surface water you will need to replace or upgrade your treatment system by 1 January 2020, or when you sell your property if before this date.

If the Environment Agency finds evidence that your septic tank discharging to a surface water is causing pollution, you will need to replace or upgrade your system earlier than 1 January 2020.

Will my Bio-Pure Sewage Treatment Plant really run up to 5 years without requiring emptying?

Yes. A typical Sewage Treatment Plant will, but it must be remembered that the tank relies on bacteria to eat the sewage. A few simple steps will ensure your plant runs for 5 years between emptying.


Can I use household cleaning products when my Bio-Pure Sewage Treatment Plant is installed?

Yes, but the cleaning products must be used in sensible quantities, remember that the chemicals can destroy the bacteria, which is essential to enable the system to work effectively. See the page ‘Do’s and Don’ts for guidelines on using the Bio-Pure.

What is population equivalent?

In simple terms, this is usually the number of bedrooms in your property plus 2. i.e. a 3 bedroom property is classed as 5 persons and a 4 bedroom property is classed as 6 persons. Please note that this only refers to residential property. For non-residential property the population equivalent differs depending on the purpose of the property (i.e. kitchen, campsite etc). Please contact us so that we can tell you the correct size Bio-Pure that would be needed.

Do you install the Bio-Pure Sewage Treatment Plants?

Yes we do install in some areas, in other areas we work with independent contractors.

How far must the Bio-Pure be situated from the house?

Building regulations have a guideline of 7m a treatment system being at least at least 7m away from the domestic dwelling, this can be dealt with on a case by case basis.

Does the Bio-Pure meet the requirements to discharge to a water causeway?

Yes, the Bio-pure meets the Environment Agency’s requirements for discharging under the general binding rules. The Bio-Pure has been tested at a PIA Centre in Germany (EN12566-3)

What is the discharging regulations and do I need it?

Discharging from a treatment system or septic tank has certain a legal requirement from the Environment Agency.

It is now broken down into a General binding rule and a permit to discharge. Everyone should find out if they come under the general binding rules or if they require a permit to discharge.

If you have any doubts contact us and speak to one of the team who can assist you.

contact us today for Friendly advise and full instructions on any of our product range