Rosep oil separators with a 10% bypass are used to clean rainwater that drains from paved surfaces such as roads, yards and parking lots, where fuel or oil can leak from vehicles.

The bypass oil separator is dimensioned for critical pour or. high flows. At maximum rainfall, 10% of the flow is purified in the oil trap and 90% goes through bypass.

Circulating pipes up to a diameter of DN400 are installed inside the separator, which facilitates installation and handling during transport, while increasing the life of the product, as soil pressure cannot damage the pipe. When the effluent drains into groundwater, an automatic shut-off or non-return valve and a sample tank are installed in the oil separator.