E-Range Sewage Treatment Systems

Clearwater offer a range of effective solutions for domestic and commercial applications and employ the well proven aerobic biological process for the treatment of sewage. For more information about our commercials solutions, please contact our customer service team.

Certificated to European Standard EN-12566

In 2005, a new European Performance Standard was introduced. EN-12566 requires manufacturers to submit their product to a testing regime that accurately measures the performance of treatment plants up to 50 population.

These tests identify how much pollution the treatment plant removes from the sewage, what level of maintenance is required, and what power is absorbed.

By holding EN-12566 certification, the Clearwater treatment plant is approved for an exemption from a permit to discharge under the new EPP2 environmental legislation.

For more information on EPP2 and off-mains regulations please contact us.

Three distinct process stages take place within the single tank:


First, coarse solids are filtered and retained for gradual breakdown. Then the resulting liquid is continuously distributed over a plastic suspended filter by an integral lift, powered by a remotely sited blower.

Finally, the solids are allowed to settle and, under normal domestic conditions, treated water of 20mg/l BOD, 30mg/l S.S., 20mg/l Ammonia can be achieved.





  • Superior performance rating.
  • Subject to consent and site conditions, the plant can discharge directly to a watercourse.
  • No mechanical or electrical components within the plant – low running and maintenance costs.
  • Low level visibility with a lockable child-proof pedestrian duty cover – safe for children and pets.
  • Controlled ventilation – minimises risk of odour nuisance.
  • Package options to all requirements and needs.
  • Easy to install and maintain with annual desludging.
  • Integral pumped discharge option available (IPS model)
  • Fully CE-marked


  1. Inlet
  2. Primary settlement tank
  3. Air lift
  4. Distributor
  5. Media
  6. Blower
  7. Outlet

Technical Details

Model Type 6 12 18
Model Ref.
Maximum Number of
Full-time Residents
p/day 6 12 18
Average Flow m³/day 1.20 2.40 3.60
BOD Load kg/day 0.36 0.72 1.10
Weight Empty kg 200 217 445
Overall Diameter m 1.85 1.85 2.70
Overall Depth m 2.20 2.70 2.60
Inlet Invert m 1.00* 1.00* 1.00*
Inlet Invert to Base m 1.20 1.70 1.60
Outlet Invert m 1.10** 1.10** 1.10**
Blower Motor Rating Watts 60 60 1.50
Drainage Fitting mm 110 110 110

*There are two depths of inlet in the range 1.0m and 1.5m.
**0.605m on IPS models.
Under normal domestic conditions a discharge of 20mg/l BOD, 30mg/l SS and 20mg/l ammonia can be achieved.

Integral Pump Systems

You may find that your soakaway area/watercourse area is some distance away from the outlet pipe where the tretment plant releases the treated water. If this is the case, you may need to use a model which has the ability to pump treated water. These are our Integral Pump models (IPS).


Invert to
Base (m)
E-Range™-1 1.2 0.36 195 1.9 2.2 1.0* 1.2 1.100 60
E-Range™-1 IPS 1.2 0.36 220 1.9 2.2 1.0* 1.2 0.605 60
E-Range™-2 2.4 0.72 217 1.9 2.7 1.0* 1.7 1.100 60
E-Range™-2 IPS 2.4 0.72 260 1.9 2.7 1.0* 1.7 0.605 60
E-Range™-3 3.6 1.10 445 2.7 2.6 1.0* 1.6 1.100 150
E-Range™-3 IPS 3.6 1.10 471 2.7 2.6 1.0* 1.6 0.605 150
E-Range™-4 5.0 1.50 470 2.7 2.6 1.0* 1.6 1.100 150
E-Range™-4IPS 5.0 1.50 495 2.7 2.6 1.0* 1.6 0.605 150

For further assistance and advice on selecting the appropriate Delta system please contact our Technical Sales who will be pleased to help. We can arrange for one of our local Area Managers to visit your site to advise on model selection and legislation. We can also recommend specialist installers if requested. This advice service is supplied free of charge. Clearwater also offers reliable solutions for commercial applications. For more information, please contact us.