Method and device for improving the efficiency of treating fluids applied to a UV reactor

A UV reactor for treating fluids, comprising a longitudinal flow chamber having a longitudinal center axis, an input for entry of fluid in the flow chamber, and an output for fluid to exit the flow chamber, where at least the input of the flow chamber comprises an inlet pipe followed by an inlet cone which as a part of the flow chamber increases the cross section of the channel from the inlet pipe to a cross section of the flow chamber of the UV reactor, said UV reactor having at least one longitudinal UV-lamp parallel to, but not coinciding with the longitudinal center axis, and where the UV-lamp is arranged such that fluid can flow along a flow path from the input to the output via the flow chamber, and so that fluid flowing along the flow path can be exposed to UV-radiation as the fluid flows from the input to the output, wherein the inlet cone has a flow guide comprising a number of radial protruding equally curved turbine blade shaped guide plates on the reverse side relative to the inlet pipe, said curving turbine blade shaped guide plates being equally distributed over the circular surface of the cone, said guide plates extending between the inlet of the cone and the cone end, wherein the inlet pipe comprises a flow rectifier comprising of at least one plate shaped body located in the inlet pipe.