The invention relates to a device for treating a fluid with UV radiation, wherein the device comprises a container (1), in which fluid (2) to be treated can be accommodated, a strand-shaped UV conductor element (3), which has an input segment (4) and an emission segment (5), wherein the emission segment (5) is arranged in the interior of the container (1) and wherein the UV radiation can be input in the input segment (4) and wherein a lateral emission of the UV radiation into the fluid (2) to be treated can be provided in the emission segment (5), and a UV radiation source (6), by means of which the UV radiation for inputting into the UV conductor element (3) can be provided.
