A system for removing divalent ions from a monoethylene glycol feed stream, the system comprising: a chemical treatment tank through which the feed stream flows, wherein chemicals are mixed with the feed stream to form insoluble carbonate and hydroxide salts; a membrane-type solid-liquid separation unit arranged to receive the feed stream with the insoluble carbonate and hydroxide salts from the chemical treatment tank through a feed stream valve, and separate it into: (i) a filtrate containing MEG, and (ii) a retentate containing the insoluble salts; a discharge line for filtrate connected to the separation unit and comprising a valve for discharging filtrate to downstream processes; a discharge line for waste slurry connected to the separation unit and comprising a waste slurry valve for removing the retentate as a waste slurry; a water source connected to the separation unit by a valve, which allows water from the water source to flow to the separation unit; and a return line connecting the separation unit and the chemical treatment tank via the discharge line for filtrate through a valve on the return line; wherein, by maintaining the waste slurry valve closed and by closing both the valve to isolate the separation unit from the chemical treatment tank and the valve to isolate the separation unit from the downstream processes, and by opening both the valve to allow water from the water source to flow to the separation unit and the valve on the return line, the retentate in the separation unit can be washed to remove MEG, and the MEG that is removed from the retentate can be carried with the water out of the separation unit back to the chemical treatment tank via the return line and thereby recovered from the retentate. a chemical treatment tank through which the feed stream flows, wherein chemicals are mixed with the feed stream to form insoluble carbonate and hydroxide salts; a membrane-type solid-liquid separation unit arranged to receive the feed stream with the insoluble carbonate and hydroxide salts from the chemical treatment tank through a feed stream valve, and separate it into: (i) a filtrate containing MEG, and (ii) a retentate containing the insoluble salts; (i) a filtrate containing MEG, and (ii) a retentate containing the insoluble salts; a discharge line for filtrate connected to the separation unit and comprising a valve for discharging filtrate to downstream processes; a discharge line for waste slurry connected to the separation unit and comprising a waste slurry valve for removing the retentate as a waste slurry; a water source connected to the separation unit by a valve, which allows water from the water source to flow to the separation unit; and a return line connecting the separation unit and the chemical treatment tank via the discharge line for filtrate through a valve on the return line; wherein, by maintaining the waste slurry valve closed and by closing both the valve to isolate the separation unit from the chemical treatment tank and the valve to isolate the separation unit from the downstream processes, and by opening both the valve to allow water from the water source to flow to the separation unit and the valve on the return line, the retentate in the separation unit can be washed to remove MEG, and the MEG that is removed from the retentate can be carried with the water out of the separation unit back to the chemical treatment tank via the return line and thereby recovered from the retentate.