A device for the treatment of substrates (2) has a container having a bottom and being filled with a treatment fluid. The treatment fluid streams in from below through the bottom of the container. At least two inlet tubes are provided for the treatment fluid underneath the container bottom. Each of the at least two inlet tubes is provided with projecting comb-like distribution channels. The at least two inlet tubes and the distribution channels are arranged in a common plane. The distribution channels of one of the at least two inlet tubes are respectively positioned between two of the distribution channels of the other one of the two inlet tubes.