Oil-Water Separators
Obtain superior separation and secure storage with Xerxes technology
Xerxes tanks meet – or exceed – industry standards
OWS with vertical-tube coalescing media –
available as UL 2215-listed model
OWS with coalescing plate technology
– available as CAN/ULC S656-listed model
Why choose a Xerxes oil-water separator?
- Designed to be 100% watertight
- Capacities from 600 to 30,000 gallons
- Single-wall and double-wall models
- Designed to withstand H-20 / HS-20 axle loads
- 30-year limited warranty
Our two coalescing options provide superior separation
Using coalescing technology, which provides better separation and flow rates than same-sized gravity separators, our OWS tanks produce effluent quality to meet customer and regulatory requirements for water runoff. We have two equally effective coalescing options:
Vertical-tube coalescing media
Polypropylene vertical-tube matrix attracts small oil droplets. The oil-laden tubes provide additional surface area to attract more oil. Fiberglass clean-water collector and inlet diffuser direct flow and minimize turbulence, allowing for efficient separation.
Coalescing plate technology
Corrugated polypropylene plates provide oil-droplet coalescing. The angled-plate pack system provides a maximum amount of coalescing surface area. With no moving parts, the coalescing pack can be cleaned in place and removed with lifting rods when full maintenance is needed.
Customers can select the appropriate flow rate and spill capacity for their specific needs, making Xerxes tanks ideal for a variety of sites and applications, including vehicle repair garages, bulk fuel plants, truck stops and commercial parking lots. Performance of a Xerxes oil-water separator is enhanced with the addition of a liquid-level monitoring system to gauge the oil level.

