the present invention provides a method and a device for dewatering a hydraulic fluid of a hydraulic system , in particular in the aerospace sector , comprising a container which has a sorbent , a feed which supplies the hydraulic fluid from the hydraulic system to the container for the hydraulic fluid to be passed through the sorbent such that it can be dewatered in a dewatering mode of the device , and a return which returns the dewatered hydraulic fluid from the container to the hydraulic system in the dewatering mode of the device . the hydraulic fluid can be dewatered continuously and very efficiently by the method and the device according to the invention .