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GRAF One2Clean Sewage Treatment Plant 18PE | G50010

£3,800.00
£4,560.00 (inc VAT)
£3,800.00 (exc VAT)

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Product Description

This product is delivered directly from the supplier, lead times vary.

 

The GRAF One2Clean 18PE is a high-performance, two-tank domestic wastewater treatment system designed for properties with up to 18 residents. This paired unit consits of 2x 6500L tanks. Utilising advanced SBR (Sequencing Batch Reactor) lifting technology, this system achieves up to 99% pollutant removal efficiency, making it one of the most effective solutions on the market for domestic off-mains sewage treatment.

The system is CE Certified and fully compliant with EN12566-3, offering excellent effluent quality that meets and exceeds regulatory standards. It’s also nutrient neutrality-friendly, ideal for sensitive discharge areas. With low energy consumption (just 46 kWh per person annually) and reduced sludge production, the One2Clean provides an efficient and cost-effective long-term investment for homeowners. No specialist wiring is needed on-site, and the unit is suitable for dry ground installations using granular base and backfill. An integrated sample chamber and user-friendly controls ensure easy maintenance and monitoring.

 

Key Benefits:

  • Strong, injection-moulded construction (15-year tank warranty)
  • 2-year technology warranty
  • Quiet operation
  • Built-in, self-cleaning sampling point
  • Plug-and-play installation – no onsite wiring required
  • Ultra-low power usage – just 46 kWh per person, per year
  • Stable for groundwater levels up to the tank’s midline
  • Compact control panel for indoor or optional outdoor kiosk

 

Model: G50010
No. of People: 18
Length (mm): 5380
Width (mm): 2190
Height (mm): 2530 - 2730
Nominal Inlet/Outlet (mm): DN100/110
Weight empty (Kg): 440
Inlet Invert Standard (mm): 690 - 890
Outlet Invert Standard* (mm): 690 - 890
Air Compressor Rating (watts): 210
Air Compressor Rating (dBA): 46
Tank Shell Warranty (years): 10
Technology Warranty (years): 2
BOD (mg/l): 7
SS (mg/l): 14
NH4-N (mg/l): 0.5

 

Graf One2Clean 18PE Drawing

Graf One2Clean Installation Guide

Graf UK Brochure

Ebara Optima Pump Specification

Graf One2Clean PIA Certificate 

Graf One2Clean IPS Pumped Option Information

Graf One2Clean Log Book

 

SKU: TANONE2GRA006

Why Buy Your Tank from Direct Drainage?

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Need help choosing the right tank? Call our team on 01388 537050.

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CUSTOMER REVIEWS

Rated 4.8/5 by Direct Drainage Customers

Based on over 600 verified reviews

VERIFIED REVIEW

Very helpful from the start to the finish

Items were despatched quickly and arrived the next day. Would recommend.

Title

North Hayne Farm Cottages | 26 June 2026

VERIFIED REVIEW

Cheapest price I could find for the pump

Cheapest price I could find for the pump and delivery the next day what more could you want.

Title

Sam Jukes | 5 November 2025

VERIFIED REVIEW

Great service!

I ordered a septic tank it was delivered within a week and the delivery driver left it in the exact right place and time. Would definitely use this company again, thanks so much.

Title

Eve Harland | December 2025

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FAQs

From choosing the right treatment plant to installation, maintenance and UK regulations, we've answered some of the most common questions to help you find the right solution for your property.

What is the difference between a septic tank and a sewage treatment plant?

A septic tank separates solids from wastewater before allowing the liquid to drain into a suitable drainage field. A sewage treatment plant goes a step further, using biological processes to treat wastewater to a higher standard before discharge. Sewage treatment plants are often the preferred choice where improved treatment performance is required.

What size sewage treatment plant do I need?

The correct size depends on the number of people your property is designed to accommodate, the expected wastewater flow and the type of property. Sewage treatment plants are commonly rated by Population Equivalent (PE). It's important to select a system with sufficient capacity to handle your property's requirements. Our team can help you choose a suitable system.

Do sewage treatment plants need electricity?

Most sewage treatment plants require electricity to operate components such as air blowers, pumps or control systems. However, power consumption varies depending on the manufacturer and model. Some systems use low-energy technology to help minimise running costs. Always check the individual product specifications before purchasing.

How often does a sewage treatment plant need emptying?

Sewage treatment plants require periodic desludging to remove accumulated solids. This is commonly carried out at least once a year, although the frequency depends on the system, usage and manufacturer's recommendations. Regular servicing and maintenance are also essential to maintain performance and help prevent costly breakdowns.

Do you supply replacement parts for sewage treatment plants?

Yes! At Direct Drainage, we supply a wide range of sewage treatment plant spare parts, including air blowers, diaphragms, filters and other essential components. Whether you're carrying out routine maintenance or replacing a faulty part, our team can help you identify a suitable replacement for your system.

Do you stock all tanks and sewage treatment systems?

We do not stock tanks and treatment systems as standard. These are supplied directly from the manufacturer. The lead times of these systems will vary. If you need an accurate delivery date, please contact us on 01388 537050.

Are your prices inclusive of VAT?

It is important to note that all prices listed on our website exclude VAT. VAT will be calculated at checkout.