Reverse osmosis system

A reverse osmosis system which can be coupled with at least one dialysis device to supply said dialysis device with high-purity permeate, comprising:

• a raw-water inlet line which supplies raw water through a valve to a buffer vessel with a level controller and then via a pump to a filter module having a primary space being separated by a semipermeable membrane from a secondary space,
• wherein the secondary space of the filter module is provided by a perforated permeate collection tube having first and second ends, the permeate collection tube being arranged within spirally arranged membrane pockets,
• the secondary space being connected to a permeate distribution system comprising a heater for cleaning and/or disinfecting permeate, a permeate inlet line with at least one connection to which the dialysis device can be coupled, a permeate return line downstream of the permeate inlet line into which a permeate outlet valve is inserted through which, in an open state, the permeate can flow in a first direction through the permeate return line and then out of the permeate return line via the permeate outlet valve into the buffer vessel, and in a closed state, the permeate flowing through the permeate return line in the first direction bypasses the buffer vessel and the permeate outlet valve and then returns to the second end of the secondary space without first passing through the primary space or the permeate inlet line, the permeate distribution system further comprising a circulation pump disposed downstream of the permeate outlet valve and upstream of the second end of the secondary space, said circulation pump being in addition to said pump;
• and
• a concentrate outlet line leading away from the primary space of the filter module to the buffer vessel,
• wherein at least the heater, the permeate inlet line, the permeate return line, and the circulation pump are arranged in a circulation circuit in which the permeate flows in the first direction,
• wherein the perforated permeate collection tube is connected at both the first and second ends to the circulation circuit, the first end being connected to the permeate inlet line and the second end being connected to the permeate return line such that the circulation circuit is formed in which the permeate can circulate.