Washdown separators

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What is a washdown separator?

A washdown separator is specifically designed to remove silt and debris from water run-off. They are typically installed at car wash facilities and equipment pressure washing facilities.

As the washdown separator fills with contaminated water, sediment such as silt and other debris such as dirt and dust, settle at the bottom of the tank below the invert of the pipe. When the water level reaches the outlet pipe, it safely leaves the separator and continues to the drainage system - leaving all forms of sediment at the bottom of the tank.

If required, a silt trap can also be installed upstream of the washdown separator to limit any potential blockages, damage or flooding in the tank.

The Environment Agency requires that discharge from washdown applications must discharge to a foul drainage system.

Example applications

  • car washes
  • pressure washing facilities
  • transportation depots
  • car dealerships
  • truck dealerships
  • farm equipment dealerships

How do washdown separators work?

Step 1

Contaminated water enters the unit where the heavier solids and silt settle to the bottom of the tank.

Step 2

The lighter liquids and hydrocarbons will rise to the surface and be retained within the tank.

Step 3

Treated water will exit the separator via the outlet.


Rewatec washdown separator being installed on site

Washdown separators maintenance

​​​​​​We have a network of local service partners to maximise the life of your Rewatec washdown separator and to provide years of reliable operation.

Our washdown separator warranty

For over 50 years, we have proudly developed sustainable and long-lasting products that make a real difference for our customers, our professional partners, and, above all, our planet.

Our experience in the industry allows us to give you a complete 25 year warranty for Rewatec washdown separators.

Rewatec 25 years warranty

Technical information

Our range of Rewatec washdown separators are available in 2,000 to 10,000 L capacities, with one, two or three chambers.

Rewatec washdown separator specification table

Training programmes

At Premier Tech we provide a full range of training programmes to fully meet the requirements of our professional partners. If you require product functionality guidance or a more detailed training course for installations, we can provide a solution to meet your needs.

Contact us for more information

Available products

We offer single stage washdown separators as standard however two and three chamber separators are available if required.


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