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Martin Currie _ Aqueum gravatar image

Your "fully demineralised" concern leads me to point out that you don't need to desalinate the entire flow, just enough to bring your chloride down to a level that the local population find a blend of desalinated and non-desalinated water acceptable.

In an area like Bangalore where land is at a premium, RO is currently likely to be the most cost effective means of desalination at significant scale.