Atlantis Double Stage 20,000 Litre Washdown Separator
£6,540.30 Exc VAT (£7,848.36 Inc VAT)
Shipping 15 – 20 Working Days
Delivery cost depends on location, access and unloading requirements.
Request A Delivery Quote
Some tanks require a personalised delivery quote due to size, location and access requirements.
Product Description
Atlantis Double Stage 20,000 Litre Washdown Separator
The Double Stage 20000 Litre Inline Washdown Separator is a high-capacity underground wastewater treatment system designed for gantry wash systems, HGV and truck wash facilities, quarry wheel washes and other high-flow commercial washdown applications. Featuring a two-stage inline separation process, it effectively removes silt, sediment, oils and hydrocarbons from contaminated wash water before it is discharged into the foul drainage system.
Manufactured in the UK from high-strength rotationally moulded polyethylene (HDPE), this separator combines exceptional durability with a lightweight construction for easier transportation and installation. Its shallow dig design reduces excavation requirements, making it an excellent choice for sites where installation depth or high groundwater levels are a consideration.
With a substantial 20,000-litre capacity and a 100 litres per minute flow rate, this is one of the largest washdown separators in the range, making it ideal for busy commercial and industrial sites that require reliable treatment of high volumes of contaminated wash water. The inline configuration ensures an efficient flow path while the two-stage separation process maximises contaminant removal and simplifies ongoing maintenance.
How Does a Double Stage Washdown Separator Work?
Wash water first enters the primary chamber, where heavier materials such as mud, grit and silt naturally settle. The partially treated water then flows into a second chamber, providing additional separation of finer sediments and hydrocarbons before cleaner water exits the system.
This two-stage process improves treatment efficiency, making it particularly suitable for commercial sites where higher volumes of contaminated wash water are generated.
Suitable For
- Gantry vehicle wash systems
- HGV and truck wash facilities
- Quarry wheel wash systems
- Commercial vehicle wash bays
- Fleet maintenance depots
- Construction and plant equipment cleaning
- Agricultural machinery wash facilities
- Industrial washdown applications
Key Features
- 20000 litre underground inline washdown separator
- Double stage separation for enhanced contaminant removal
- Inline configuration for high-volume washdown systems
- Designed for gantry wash, truck wash and quarry wheel wash applications
- Suitable for high-flow commercial washdown facilities
- 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.
Product Specification
| Dimensions | L 9920 x W 2710 x H 1725 mm |
|---|---|
| Manufacturer | |
| Flow Rate | 100 Litres per minute |
| Material |
Delivery and Returns
Delivery Information
Shipping costs for standard postcodes within UK Mainland are calculated at checkout when a postcode is entered.
Delivery charges are based on current manufacturer and courier rates. In some cases, delivery costs may be subject to confirmation after an order has been placed due to supplier delivery zones or freight changes. If an additional delivery charge applies, the customer will be notified before the order is dispatched and given the option to proceed or cancel the order for a full refund.
Some areas may incur additional charges, including:
-
Scottish Highlands and Islands
-
Isle of Wight, Channel Islands, Isle of Man, Anglesey, Western Isles, Shetland Islands, Orkney Islands, Isles of Scilly
-
Northern Ireland
-
Republic of Ireland
Additional charges may apply for postcodes in these areas:
AB, BT, CA, CT, DD, DG, EH, FK, G, GY, IM, IV, JE, KA, KW, KY, LD, LL, ML, PA, PH, PO 30–41, SA, SY, TD, TN, TR, ZE
If your postcode is listed above, please contact us before ordering for a shipping quote.
Some products are only available for delivery within England & Wales; this will be stated on the product page. If you are outside this area, please contact us for a quotation.
Delivery Lead Times
-
Refer to individual product pages for expected delivery times.
-
Custom orders may take longer; please enquire before ordering.
-
Items on the same order may be delivered separately due to stock locations.
-
If delivery is delayed, we will notify you via email.
Delivery Method
-
All deliveries are kerbside unless stated otherwise.
-
For larger items, customer offloading may be required.
-
Someone must be available to receive and inspect the goods.
-
Goods may be left in a safe place at the customer’s risk; Online Tank Store cannot accept responsibility once goods are left.
Note: By signing for the goods, you confirm that the outer packaging is intact and free from visible damage. Any visible damage must be noted on the delivery paperwork or the delivery refused.
Scheduled delivery times may be accommodated; please add instructions in the Customer Notes section at checkout.
Missing or Faulty Items
If items are missing or arrive damaged:
-
Contact us within 48 hours of delivery at [email protected]
-
Provide:
-
Order number
-
Photos of the goods
-
Brief description of the issue
-
We may require images for the manufacturer to provide replacements.
Delivery Charges & Returns
-
Ensure the product is the correct size and suitable for your intended use.
-
Standard tanks (no customisation) are returnable but subject to a restocking charge and must be returned in A1 condition. Returns may be expensive due to size and weight; please check before ordering.
-
Failed delivery attempts: After one unsuccessful delivery attempt, items will be returned to the depot, and redelivery charges may apply.
-
Special or custom tanks are non-returnable. If the wrong product is ordered or the item is no longer required, it cannot be returned, and no refund will be issued.
Returns & Refunds
Our full returns and refund policy can be found by clicking here.
It is important to us that the items you order are correct for your needs however, we understand that situations and requirements can change. It can be costly to return an order so please ensure you are certain of your requirements before you order and that you have read the returns policy above for details.
Custom Tank – An order is considered ‘custom’ when a non-standard configuration or colour is requested. Custom orders are not eligible for return so please ensure the product is what you require before ordering. By purchasing, you are agreeing to the above terms.