Combination of a single-station reverse osmosis device with a hemodialysis device

A combination comprising a single-station reverse osmosis device (RO device) with a hemodialysis device (HD device), the RO device comprising a filter with a membrane which separates a primary circuit from a secondary circuit, a raw-water supply line terminating in the primary circuit and the secondary circuit being connected to a permeate inlet valve of the HD device via a connection line containing a conductivity measuring device, and a concentrate connection of the primary circuit leading to an outlet via a concentrate line containing a flow-resistance means, wherein at least one cleaning chamber for at least one of the raw water and the permeate is connected to the RO device, and that upon request by the HD device, the permeate flows either via the permeate inlet valve into the HD device or via a flushing valve of the HD device to the outlet.