According to the Center for International Trade Development, India
Links:
[1] http://admin.indiaenvironmentportal.org.in/reports-documents/water-water-treatment-india-market-opportunities-swiss-companies
[2] http://admin.indiaenvironmentportal.org.in/category/author/marwas-ag
[3] http://admin.indiaenvironmentportal.org.in/category/publisher/osec
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-treatment-technology
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-resources
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-harvesting
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/desalination
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/irrigation
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-quality
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wastewater-recycling
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/industrial-waste