Abstract: The invention relates to a water treatment device for a passenger aircraft including a water inlet port, a water outlet port, a pipe for connecting the water inlet port to the water outlet port, a filtration device located in the pipe and an electronic control device, wherein the electronic control device is adapted to monitor at least one parameter associated with the status of the filtration device: volume of water flowing through the filtration device on the basis of a corresponding measuring signal; time period after a filter exchange in the filtration device; and/or pressure loss over the filtration device on the basis of a corresponding measuring signal; and, if the monitored parameter fulfils certain criteria, to determine a filter exchange request and to output a filter exchange signal.