The invention relates to a device comprising at least three hydrocyclones and a pump. The pump comprises a centrifugal turbine, an electric motor capable of driving the turbine in rotation, a distributor capable of collecting the water recirculated by the turbine and introducing the water into the hydrocyclones. The distributor comprises at least one distribution channel for each hydrocyclone, each channel extending from an inlet orifice formed in a central circular housing to an outlet orifice formed in a wall of a hydrocyclone, and discharging into the hydrocyclone tangentially to the wall of this hydrocyclone. The centrifugal turbine is housed inside the central housing of the distributor, opposite the inlet orifices of the channels.