Revision history [back]
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.