The invention relates to a permeate spacer module comprising a spacer and at least one collection device, which spacer comprises of support members which being spaced apart by at least one inserted element forming flow space or flow channels between the support members and the inserted element for guiding permeates to at least one permeate collection device connected to the flow space or the flowchannels. The invention relates further to a membrane system comprising the permeate space module, a process for operating the membrane system, use of the membrane system, a membrane plant and use ofthe membrane plant.