Britain’s only desalination plant still out of action as hosepipe ban fears return – UK

Now Thames Water has revealed that although the maintenance work has now been completed it has since faced problems obtaining carbon dioxide, which is needed for a process where minerals are restored to the water after the removal of sea salt.

The desalination plant was opened as a drought contingency in 2010 and can supply drinking water to 400,000 homes in the capital at times of crisis.

(Source)