Oil separators with By-Pass are dimensioned to critical downpour or heavy rainfall. In the case of maximum or critical amount of meteor water, 20% of the total inflow will flow through the coalescent filter, while 80% wgoes through the by-pass pipeline.

Oil separators are intended for underground installations. Access to the inside of the oil separator is provided by a polyethylene [PE] cover. which are mounted on telescopic extensions with simple adjustment to the terrain. The size of connecting pipes is determined in advance in accordance with the standard of the oil separators.

The coalescent filter in the oil separators ensures that oil droplets, which failed to separate in the first chamber are eliminated in the second chamber.