One2Clean Sewage Treatment Plant

One2Clean Xtra

An advanced, homeowner-friendly solution building on the proven One2Clean system.

  • Safer, cleaner desludging – The optional sludge removal pipe (standard on larger units) allows desludging without disturbing internal components, reducing maintenance risks.

  • Smarter control and added reassurance – The advanced control panel supports optional add-ons and gives clearer visibility over system performance for greater convenience and peace of mind.

  • High treatment quality for stricter standards -Delivers excellent effluent quality and can be configured to support nutrient neutrality in sensitive areas.

  • Ultra-low power use with lower running costs – Uses minimal energy, helping keep long-term operating costs down.

  • Quiet operation – Runs at low noise levels, making it a discreet option for homes and gardens.

One2Clean Xtra takes everything great about the original One2Clean and adds more control, safety, and ease of use, the perfect choice for those who want extra convenience and reliability.

Get Your Sewage Treatment Plant Commissioned by GRAF UK at No Extra Cost

Innovative Design Features

Flush-to-Ground Lid

The system’s lid is designed to be flush with the ground. Helping to preserve the look of your garden and eliminating any unsightly protrusions.

Vehicle Loading Lid

This unique feature allows for installation in limited spaces, such as driveways, without compromising space or appearance.

Integrated Sampling Chamber

The built-in sampling chamber streamlines your quality assurance process, saving you time and money by eliminating the need for additional installations.

Gravel Backfill

This installation method suits various ground conditions and is cost-effective, saving you significant installation costs compared to traditional methods.

No Moving Parts

The simplicity of design with no moving parts or electrical components inside the tank makes maintenance easy and efficient. All servicing can be handled via an external control panel and compressor, ensuring a hassle-free experience.

Optional Raised Outlet

This option saves you time, money, and future headaches. Install your drainage field closer to the surface, reducing excavation costs. As a result you can enjoy improved flow and fewer blockages, while potentially eliminating the need for a pumped outlet.

Sizing

Population equivalent (PE) Max. daily flow [l/d] Max. organic load [kg BOD5/d] Total volume [l] Length [mm] Width [mm] Height [mm] Weight [kg] Product code
5 750 0.3 3750 2280 1755 1880 150 G50400
7 1050 0.42 4800 2280 1985 2110 185 G50403
9 1350 0.54 6500 2390 2190 2390 220 G50406
12 1800 0.72 8500 3500 2040 2515 380 G50430
15 2250 0.9 10000 3520 2240 2575 455 G50433
19 2850 1.14 13000 4000 2420 2755 510 G50436
24 3600 1.44 16000 4590 2500 3160 890 G50450
32 4800 1.92 22000 6230 2500 3160 1085 G50452
45 6750 2.70 32000 8555 2500 3160 1430 G50454
50 7500 3.00 38000 9925 2500 3160 1630 G50456
60 9000 3.60 44000 11440 2500 3160 1840 G50458
70 10500 4.20 48000 12140 2500 3160 1970 G50460

How it works

1. Wastewater treatment

The wastewater arrives directly in the biological zone without the need for pumping processes. Aeration of the entire container leads to immediate wastewater activation. The microorganisms begin the biological cleaning process without delay.

2. Settling phase

Aeration is interrupted by the control unit, the activated sludge sinks to the bottom. A clear water zone develops in the upper part of the container.

3. Clear water extraction

The treated clear water is extracted from the system and the cleaning process can begin once more.

Treatment performance

Biological Oxygen Demand (BOD) Suspended Solids (SS) Ammonia (NH₄-N) Phosphate (Ptot) Nitrate (Ntot)
7 mg/l (98.4%) 14 mg/l (96.6%) 0.5 mg/ (98.3%) 1.6 mg/l (80.2%) 7.9 mg/l (87.0%)
*Testing was carried out under PIA, testing number: PIA2014-216B14.01.e. Treatment efficiency and performance may vary depending on influent samples coming into tank.

Why choose the One2Clean Xtra?

Save on your energy bills

No need to worry about how much your energy bill will go up by as our systems use as low as 0.63 kWh/day – less power than your fridge!

Meet nutrient neutrality

Ideal for properties in nutrient-sensitive areas, our systems consistently achieve one of the highest discharge qualities.

Enjoy peace and quiet

Say goodbye to noisy treatment plants. Our system’s compressor operates as low as 36 decibels – quieter than a library!

Case Studies

Simultaneous Installation of Two Graf One2Clean Systems

Simultaneous Installation of Two Graf One2Clean Systems
Graf UK One2Clean Wastewater Treatment Installation by WCI in Somerset

Graf UK One2Clean Wastewater Treatment Installation by WCI in Somerset
Building Off-Grid: Why We Chose a Graf Wastewater Treatment System

Building Off-Grid: Why We Chose a Graf Wastewater Treatment System

Warranty

*1 year warranty following commissioning & 2 additional years if serviced annually.

Downloads

  • EN_PIA-Certificate_PIA2014-216B14.03_one2cleanXtra.pdf Download
  • EN_PIA-Certificate_PIA2015-208B15_one2cleanXtra-P.pdf Download
  • 5PE-One2cleanXtra_STANDARD_DETAIL_CARAT_3750L.pdf Download
  • 7PE-One2cleanXtra_STANDARD_DETAIL_CARAT_4800L.pdf Download
  • 9PE-One2cleanXtra_STANDARD_DETAIL_CARAT_6400L.pdf Download
  • 12PE-One2cleanXtra_STANDARD_DETAIL_CARATXL_8500L.pdf Download
  • 15PE-One2cleanXtra_STANDARD_DETAIL_CARATXL_10000L.pdf Download
  • 19PE-One2cleanXtra_STANDARD_DETAIL_CARATXL_13000L.pdf Download
  • 24PE_One2cleanXtra_STANDARD_DETAIL_CARATXL_16000L.pdf Download
  • 32PE_One2cleanXtra_STANDARD_DETAIL_CARATXL_22000L.pdf Download
  • 45PE_One2cleanXtra_STANDARD_DETAIL_CARATXXL_32000L2xcompressor.pdf Download
  • 50PE_One2cleanXtra_STANDARD_DETAIL_CARATXXL_38000L2xcompressor.pdf Download
  • 60PE_One2cleanXtra_STANDARD_DETAIL_CARATXXL_44000L2xcompressor.pdf Download
  • 70PE_One2cleanXtra_STANDARD_DETAIL_CARATXXL_48000LSideChannelBlower.pdf Download