Interesting Links to articles and studies on Water treatment, Sewage water treatment and Solar water
heaters http://www.physorg.com/news155814806.html  (a short article about solar thermal heating in India)

Solar water heating case study in Tamil Nadu, India
http://www.retscreen.net/ang/case_studies_heating_solar_water_heater_hotel_motel_india.php

Solar water heater article:
http://www.greenamericatoday.org/pubs/realgreen/articles/solarwaterheaters.cfm

Solar water heater in India:
http://www.treehugger.com/files/2009/03/solar‐water‐heater‐best‐use‐of‐solar‐power‐indianscientists‐
assert.php

Analysis on Solar water heater:
http://www.reedconstructiondata.com/articles/read/solar‐water‐heating/

Benefits of Solar water heater:
http://environment.about.com/od/renewableenergy/a/solar_water_hea.htm
http://www.servicemagic.com/article.show.Solar‐Water‐Heaters.8921.html

Research Report on Water Treatment in countries including India:
http://www.cee.mtu.edu/peacecorps/documents_july03/Wastewater_treatment_and_reuse_FINAL.pdf
 
Waste water treatment: http://www.indiaenvironmentportal.org.in/node/18646

Great article on Water treatment project done in India: http://www.watertechnology.net/projects/tirupur  
Need for waste water solution in India:
http://www.projectsmonitor.com/detailnews.asp?newsid=17422