The only wastewater underground tank of it's kind!
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.
What makes the One2Clean unique?
- Only one tank with just one chamber required.
- Less energy consumption and less water.
- No mechanical elements in the wastewater.
- No pumps in the wastewater.
- No electrical components in the wastewater.
- Incredibly low volume of sewage sludge.
PLEASE CALL 01388 537 050 FOR AN ACCURATE LEAD TIME
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.
FREE commissioning is available with every system, carried out by an accredited GRAF UK partner.
Enjoy a 15-year warranty on the tank shell and 2-year warranty on the internal technology when installed and serviced by a GRAF-certified technician.
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
Specifications:
| Specification |
Value |
| Model |
G50204
|
| Population Capacity |
Up to 15 People |
| Dimensions (L x W x H) |
3520 x 2240 x 2575 mm |
| Inlet/Outlet Diameter |
DN100 / 110 |
| Weight (Empty) |
455 kg |
| Inlet Invert |
630–830 mm |
| Outlet Invert |
630–830 mm |
| Air Compressor Power |
58 Watts |
| Compressor Noise |
36 dBA |
| BOD |
7 mg/l |
| Suspended Solids |
14 mg/l |
| Ammonium (NH4-N) |
0.5 mg/l |
Options & Accessories:
Outlet type: Gravity or pumped
Invert depth extensions: Available with standard, 310mm, or trimmable risers
Lid options: Pedestrian duty (standard) or vehicle duty up to 3.5t
Maxi Dome cover: Required for vehicle-duty installation
Outdoor controller kiosk: Available for installations more than 20m from the building
Need help selecting the right system? Call our expert team on 01388 537 050 or email us with your requirements – we’re happy to help.
