Oil water separators are used to remove contaminants, such as petrol oil, grease and silt from water run-off, to prevent them being discharged into the watercourse.

Retain and separate

Our separators (often called interceptors) achieve two levels of final discharge into the drainage system. The bypass separator (class 1 discharge) is designed for larger, hard-standing areas, prone to hydrocarbon spillages. It retains hydrocarbon contaminants that enter the separator in the first 10% of any storm and achieves a final discharge to surface water drain of less that 5mg/l oil to water. Additionally, the bypass separator (class 2 discharge) offers a final discharge to surface or foul water drain and is 100ml/l oil to water.


The full retention separator is for more demanding applications such as fuel or storage points, plant hire equipment yards and vehicle dismantling workshops where the risk of hydrocarbon spillages is greater. It is also available to achieve both Class 1 and Class 2 discharge options.

Enquire about separators

Key features

As well as our range of bypass and full retention separators for wastewater treatment, we’ve also developed a compact high performance unit that’s unique to the market. It’s compatible with any pipework without affecting contamination retention or separator performance.

  • Tested

    All certified by BSI and conform to Environment Agency PPG3 requirements for wastewater treatment

  • Design & fabrication

    Fitted with inlet and outlet connectors, vent points within necks and extension access shafts for deep inverts

  • Stilt storage

    Volume inclusive

  • Easy to install and maintain

    Lightweight units that are maintained from ground level

Typical applications

It’s vital to install oil water separators where surface water runs off large standing areas. Typical applications would include:

  • Surface car parks
  • Road schemes
  • Garage forecourts
  • Industrial estates
  • Lightly contaminated commercial areas