Atlantis Triple Stage 5400 Litre Washdown Separator
The Double Stage 5400 Litre Washdown Separator is a high-capacity underground wastewater treatment system designed for commercial vehicle wash bays, fleet maintenance depots and industrial washdown facilities. Featuring a two-stage separation process, it effectively removes silt, sediment, oils and hydrocarbons from contaminated wash water before it enters the foul drainage system.
Manufactured in the UK from high-strength rotationally moulded polyethylene (HDPE), this washdown separator combines exceptional strength with a lightweight construction for easier transportation and installation. Its shallow dig design helps minimise excavation work, making it particularly suitable for sites with limited excavation depth or higher groundwater levels.
With a generous 5,400-litre capacity, this double stage separator is designed for busy commercial wash facilities handling larger volumes of contaminated wash water. Large access openings also provide easy access for routine inspection, cleaning and maintenance, helping to ensure reliable long-term performance.
Suitable For
- Commercial car wash facilities
- Vehicle valeting centres
- Fleet maintenance depots
- HGV and commercial vehicle wash bays
- Agricultural machinery cleaning
- Plant and equipment wash facilities
- Pressure washing contractors
- Tool hire depots
- Industrial washdown applications
Key Features
- 5400 litre underground washdown separator
- Double stage separation for enhanced contaminant removal
- Designed for commercial and industrial vehicle wash applications
- Separates silt, sediment, oils and hydrocarbons
- High-strength rotationally moulded HDPE construction
- Lightweight for easier transportation and installation
- Shallow dig design helps reduce excavation costs
- Suitable for areas with higher water tables
- Easy access for inspection, emptying and maintenance
- Manufactured in the UK
Optional Extras
- Telescopic Neck – Extends the existing turret by approximately 300mm to 800mm for deeper installations.
- Pedestrian Lid Cover – Suitable for installations accessed by foot traffic only.
- Vehicle Rated Lid Cover – Designed for installations beneath driveways and areas subject to vehicle traffic.
- Silt Alarm – Monitors silt levels within the separator and provides an early warning when maintenance or emptying is required, helping maintain efficient system performance.
- Hydrocarbon Alarm – Monitors oil and hydrocarbon levels within the separator, providing an early warning to help protect the drainage system and support planned maintenance.
Important Information
Waste collected from vehicle washing and cleaning operations may be classified as contaminated waste. Any accumulated silt, oils and hydrocarbons should be removed and disposed of responsibly by a registered waste carrier at an appropriately licensed waste management facility.







