BypassSeparators
Surface water oil interception.
Klargester Bypass Separator - NSBE040 - NSBE125 up to 69,444M² Drainage Area
POAPrice on applicationView product
Geoceptor Bypass Separator - NSB 3.5 1944 sqm
£1,005.00EX VAT · £1,206.00 INCView product
Klargester Bypass Separator - NSBP003 - 1670M² Drainage Area
£1,014.00EX VAT · £1,216.80 INCView product
Geoceptor Bypass Separator - NSB 4.5 2500 sqm
£1,025.00EX VAT · £1,230.00 INCView product
Geoceptor Bypass Separator - NSB 6 3333 sqm
£1,050.00EX VAT · £1,260.00 INCView product
Klargester Bypass Separator - NSBP004 - 2500M² Drainage Area
£1,100.00EX VAT · £1,320.00 INCView product
Klargester Bypass Separator - NSBP006 - 3335M² Drainage Area
£1,201.00EX VAT · £1,441.20 INCView product
Geoceptor Bypass Separator - NSB 8 4444 sqm
£1,230.00EX VAT · £1,476.00 INCView product
Geoceptor Bypass Separator - NSB 10 5555 sqm
£1,455.00EX VAT · £1,746.00 INCView product
Geoceptor Bypass Separator - NSB 12.5 6940 sqm
£1,565.00EX VAT · £1,878.00 INCView product
Klargester Bypass Separator - NSBE010 - 5560M² Drainage Area
£1,649.00EX VAT · £1,978.80 INCView product
Geoceptor Bypass Separator - NSB 15 8333 sqm
£1,665.00EX VAT · £1,998.00 INCView product
Geoceptor Bypass Separator - NSB 18 10000 sqm
£2,165.00EX VAT · £2,598.00 INCView product
Klargester Bypass Separator - NSBE015 - 8335M² Drainage Area
£2,259.00EX VAT · £2,710.80 INCView product
Klargester Bypass Separator - NSBE020 - 11,111M² Drainage Area
£2,765.00EX VAT · £3,318.00 INCView product
Klargester Bypass Separator - NSBE025 - 13,890M² Drainage Area
£3,603.00EX VAT · £4,323.60 INCView product
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Sizing, regulations, installation. Our team has been answering these questions for over 25 years.
When managing surface water drainage in areas with lower contamination risks, bypass separators emerge as a strategic and intelligent approach to environmental protection. Designed for scenarios where full-scale treatment might be unnecessary, these separators provide targeted water management for surface car parks, roadways, and lightly contaminated commercial areas. Your bypass separator offers a pragmatic response to environmental challenges, balancing practical risk management with effective pollution control in locations where the likelihood of simultaneous large spillages and heavy rainfall remains minimal. These sophisticated systems are engineered to handle varying water flows with precision, intercepting potential contaminants while allowing excess water to bypass the primary treatment mechanism during high-volume scenarios. Unlike full retention systems, bypass separators offer a nuanced approach to water management, providing protection where it matters most without over-engineering your drainage infrastructure. These systems work quietly and effectively, capturing oils, sediments, and potential pollutants while ensuring that your drainage system remains functional during peak flow conditions.
Bypass Separators FAQs
What's the difference between a bypass separator and a full retention separator?
A full retention separator treats the entire flow from a site, including storm water, which means it needs to be sized for peak rainfall events. A bypass separator only treats the first, most polluted flush of water and allows higher volumes during heavy rain to bypass the separation chamber untreated. Bypass separators are smaller and more cost-effective, but they're only suitable where the risk of a large spillage coinciding with heavy rainfall is genuinely low.
Where can a bypass separator be used instead of a full retention system?
Bypass separators are generally accepted for surface car parks, access roads, and lightly trafficked commercial yards where oil contamination risk is low and there's no significant risk of a major spillage. They're not appropriate for fuel stations, tanker loading areas, or sites handling bulk oils and chemicals, where full retention is required. Your drainage strategy or local authority conditions will usually specify which type is needed, so it's worth checking before you order.
How do I size a bypass separator correctly?
Sizing is based on the catchment area draining to the unit, the peak rainfall intensity for your region, and the required bypass flow rate, calculated to EN 858-2. Undersizing risks pollutants passing through untreated during normal rainfall, while oversizing adds unnecessary cost. We'd recommend having your drainage engineer confirm the design flow rate before you order, as this determines the separator size, not just the car park area alone.
Are bypass separators available in GRP or concrete construction?
Yes, most bypass separators in this range are manufactured from GRP (fibreglass), which is lightweight, corrosion-resistant and straightforward to install without heavy lifting equipment. Concrete units are also available for larger installations or where additional structural strength is needed, such as under trafficked areas. GRP tends to suit most surface car park and roadway applications where ground conditions and access allow for a lighter unit.
What maintenance does a bypass separator need once installed?
Bypass separators need regular inspection to check oil and sediment levels, typically every six months, along with a full service and tanker-out at least once a year in line with EN 858 guidance. Neglecting maintenance reduces the separator's effective capacity and can lead to pollutants discharging into the drainage system. Many sites also fit an automatic warning device or high-level alarm so build-up is flagged before it becomes a compliance issue.
Do I need building regs or Environment Agency approval to install one?
Surface water discharge consent from your local authority or water company is usually required, and the Environment Agency may have an interest if you're discharging to a watercourse. Building control sign-off typically covers the below-ground installation and any structural or drainage connection work. It's worth confirming requirements with your local planning and drainage authority before installation, as conditions vary by site and discharge point.