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6 to 12 Population

Need assistance or advice with a product or lead time? Call our friendly Customer Services Team on 0117 244 4099 for expert help........don't forget we price match on most products!

6 to 12 Person Domestic sewage treatment plants

Domestic sewage treatment plants are sized based upon the number of bedrooms in a property. 6 Person (6PE) sewage treatment plants are suitable for a house with up to and including 4 bedrooms, this is by far the most popular size for single dwellings. Above 4 bedrooms (6PE) you add 1 P per bedroom so, for instance, a 5 bedroom house would require a 7 person treatment plant (7PE) and 6 bedroom house would require an 8 person treatment plant (8PE) and so on.

A 12 person sewage treatment plant (12PE) will be suitable for up to 2 x 4 Bedroom properties if they are sharing a system.

When choosing the correct plant it is important to consider any future development of the property as Building Control will insist on a sewage treatment plant which is capable of handling the correct flows and loads for the property. If for instance you have a 3-bed house and are planning on adding a single bedroom annexe you should allow for this when sizing the plant and opt for a minimum of an 8 person plant (8PE).

If in doubt, please contact us so we can advise you on the most suitable size for your property or project. 

We offer a wide variety of domestic sewage treatment plants, suitable for households of 6 to 12 people, from trusted providers including Marsh Industries, Tricel, and Harlequin. Explore our full range below. 

WTE VORTEX 4 Person Sewage Treatment Plant

Manufactured by WTE the VORTEX sewage treatment plant is a premium version of WTE's low-cost QUANTUM sewage treatment plant. The VORTEX is an Advanced..

now £1,925.00 (ex. VAT) was £2,394.00 (inc. VAT) now £2,310.00 (inc. VAT)

Tricel NOVOUK6GSR - 6 Person Economy Sewage Treatment Plant | 6PE

  The Tricel Novo 6GSR is an economy version of the Tricel Novo UK6 wastewater treatment plant.   This plant is only available with a gravit..

£1,790.00 (ex. VAT) £2,148.00 (inc. VAT)

WTE QUANTUM 6 Person Sewage Treatment Plant

Manufactured by WTE the QUANTUM sewage treatment plant is an economy version of WTE's best-selling VORTEX sewage treatment plant. The QUANTUM is an Ad..

£1,395.00 (ex. VAT) £1,674.00 (inc. VAT)

Clearwater BioAir CW2 - 6 Person Economy Sewage Treatment Plant | 6PE

The new Clearwater BioAir CW2 sewage treatment plant uses aerated technology to produce a high-level water quality discharge. This CW2 version is suit..

£1,916.00 (ex. VAT) £2,299.20 (inc. VAT)

Harlequin CAP6 - 6 Person Sewage Treatment Plant

The Harlequin CAP6 is a compact sewage treatment plant designed specifically for domestic installations for up to 6 inhabitants (4 bedrooms). It is a ..

£2,135.00 (ex. VAT) £2,562.00 (inc. VAT)

Hydroclear 6 Person GRP Sewage Treatment Plant HGRP6/EC

  Manufactured by Harlequin, this GRP version of the Hydroclear sewage treatment plant is a shallow dig option with an overall depth of 1640mm! ..

£2,695.00 (ex. VAT) £3,234.00 (inc. VAT)

Hydroclear 6 Person Sewage Treatment Plant HC6

The HydroClear, represents significant progress for the domestic wastewater industry. Contemporary design engineering and analysis software and sta..

£2,195.00 (ex. VAT) £2,634.00 (inc. VAT)

Klargester BioDisc BA - 6 Person Sewage Treatment Plant | 6PE

The Klargester Domestic BioDisc is a package sewage treatment plant designed for use in domestic dwellings, small offices and light industrial premise..

£4,541.00 (ex. VAT) £5,449.20 (inc. VAT)

Klargester BioTec+ 2 - 6 Person Sewage Treatment Plant | 6PE

The new Klargester BioTec+ 2, sewage treatment plant is suitable for properties up to and including 4 bedrooms. The BioTec+ uses proven aerated techno..

£2,415.00 (ex. VAT) £2,898.00 (inc. VAT)

Marsh Ensign 6PE Sewage Treatment Plant

The Marsh Ensign 6 is an economical sewage treatment plant which complies with BS EN 12566-3. With a population equivalent of 6, this treatment plant ..

£1,765.00 (ex. VAT) £2,118.00 (inc. VAT)

Marsh Ensign Ultra 6PE Sewage Treatment Plant

The Ultra Model of the Marsh Ensign 6PE Sewage Treatment Plant is an upgrade on the Ensign Standard sewage treatment plant which also complies with BS..

£2,485.00 (ex. VAT) £2,982.00 (inc. VAT)

Marsh Gemini 6PE Combined SBR and Phosphate Removal Plant

The Marsh Gemini is a combined sewage treatment system that has been designed to significantly reduce the number of nitrates and phosphates discharged..

£4,190.00 (ex. VAT) £5,028.00 (inc. VAT)

Marsh Nutra-Lite 6PE Sewage Treatment Plant

The Marsh Nutra-Lite range of sewage treatment plants has been designed to significantly reduce the number of nitrates discharged during wastewater tr..

£2,195.00 (ex. VAT) £2,634.00 (inc. VAT)

Marsh Shallow Ensign 6 Person Sewage Treatment Plant

The Marsh Shallow Ensign 6 is a shallow-dig sewage treatment plant that complies with BS EN 12566-3. It is ideal for excavating in hard rock or in dif..

£2,780.00 (ex. VAT) £3,336.00 (inc. VAT)

Marsh Ultra Polylok L 6 Person Sewage Treatment Plant

The Marsh Ultra Polylok L6 (UPL) is a domestic sewage treatment plant which complies with BS EN 12566-3. With a population equivalent of 6, this sewag..

£2,295.00 (ex. VAT) £2,754.00 (inc. VAT)

Tricel NOVOUK6 - 6 Person Sewage Treatment Plant | 6PE

  Tricel Novo wastewater treatment plants are reliable, easy to install and simple to maintain for all wastewater requirements. The Tricel N..

£2,065.00 (ex. VAT) £2,478.00 (inc. VAT)

WPL Diamond DMS2 - 6 Person Sewage Treatment Plant Gravity Outlet

The WPL Diamond DMS2 sewage treatment plant is suitable for up to and including a 4 bedroom house or a population of up to 6 people. As well as achiev..

£2,244.00 (ex. VAT) £2,692.80 (inc. VAT)

WTE VORTEX 6 Person Sewage Treatment Plant

Manufactured by WTE the VORTEX sewage treatment plant is a premium version of WTE's low-cost QUANTUM sewage treatment plant. The VORTEX is an Advanced..

now £2,149.00 (ex. VAT) was £2,700.00 (inc. VAT) now £2,578.80 (inc. VAT)

GRAF One2Clean Sewage Treatment Plant 7PE

The GRAF One2Clean system is a single-chamber wastewater treatment system capable of offering up to 99% pollutant removal with SBR lifting technology...

£2,251.00 (ex. VAT) £2,701.20 (inc. VAT)

Tricel NOVOUK8GSR - 8 Person Economy Sewage Treatment Plant | 8PE

  The Tricel Novo 8GSR is an economy version of the Tricel Novo UK8 wastewater treatment plant.   This plant is only available with a gravit..

£2,060.00 (ex. VAT) £2,472.00 (inc. VAT)

Marsh Ensign 8PE Sewage Treatment Plant

The Marsh Ensign 8 is an economical sewage treatment plant which complies with BS EN 12566-3. With a population equivalent of 8, this treatment plant ..

£1,960.00 (ex. VAT) £2,352.00 (inc. VAT)

Marsh Ensign Ultra 8PE Sewage Treatment Plant

The Marsh Ensign Ultra 8PE is an upgrade on the Ensign Standard sewage treatment plant which also complies with BS EN 12566-3. With a population equiv..

£2,655.00 (ex. VAT) £3,186.00 (inc. VAT)

Marsh Shallow Ensign 8 Person Sewage Treatment Plant

The Marsh Shallow Ensign 8 is a shallow-dig sewage treatment plant that complies with BS EN 12566-3. It is ideal for excavating in hard rock or in dif..

£2,965.00 (ex. VAT) £3,558.00 (inc. VAT)

Tricel NOVOUK8 - 8 Person Sewage Treatment Plant | 8PE

Tricel Novo wastewater treatment plants are reliable, easy to install and simple to maintain for all wastewater requirements. The Tricel Novo s..

£2,298.00 (ex. VAT) £2,757.60 (inc. VAT)

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Monday 22nd June 2026
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