Marsh Hydroil™ Wash-down separators

Pollution prevention

Available in capacities from 2000-20,000 litres, the Marsh washdown oil separator range safely removes silt and debris from vehicle wash-down facilities.

These units are primarily used on car wash bays, pressure wash facilities or other cleaning facilities where the effluent must be discharged to the foul water drainage system.

It is a legal requirement to install a silt trap or wash-down separator on commercial sites, such as vehicle wash bays, where there is an environmental risk of contamination from dirt, brake dust, traffic film residue, cleaning agents, oil, etc. In all cases, you should contact your local building control or environmental agency for specific site requirements.

Easy access turrets for maintenance and servicing (Turret guards optional) are available. Variable invert depths and inlet/outlet configurations are also available ­­­to suit individual site conditions. Please contact Marsh Industries upon specification.

As with all Marsh products, the tank body is guaranteed for 25 years with a design life of 50 years, providing it is installed in accordance with the manufacturers installation instructions

Configuration and components are shown for illustration purposes only

Marsh Hydroil washdown oil separator

  • Heavy duty shells enable installation in all ground conditions
  • Tank shells guaranteed for 25 years with a design life of 50 years
  • Variable invert depths and inlet/outlet configurations ­­­to suit individual site conditions
  • Easy access turrets for maintenance and servicing (Turret guards optional)
  • Optional Polylok filter can further reduce pollutants from entering the drainage system
  • Various alarm types available (Required by EN858-1)
  • Corrosion resistant

Model Capacity (litres) Diameter Length Height Connection size Inlet invert Outlet invert
WD2800 2800 1250 3000 1750 110 700 750
WD3800 3800 1250 4000 1750 110 700 750
WD4500 4500 1600 2650 2100 110 700 750
WD6000 6000 1800 2950 2300 110 700 750
WD8000 8000 1800 3600 2300 160 700 750
WD10000 10000 1800 4200 2300 160 700 750
WD12000 12000 1800 5000 2300 160 700 750
WD15000 15000 2500 3100 3000 160 700 750
WD18000 18000 2500 4100 3000 160 700 750
WD20000 20000 2500 4500 3000 160 700 750

The dimensions given on this page are for guidance only.
For precise tank sizes and configurations, please contact Marsh Industries.
Number of access shafts will be built to suit site specifications and to maintain safe access for emptying.
All dimensions in mm


Marsh Hydroil brochure

Marsh Hydroil manual

Marsh Hydroil CE Certificate