Compared to other lakes in Bengaluru, Sankey tank is well-maintained and largely free of sewage.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/sankey-tank-shines-city-polluted-dirty-lakes
[2] http://admin.indiaenvironmentportal.org.in/category/author/naveen-menezes
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/deccan-herald-bangalore
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/karnataka
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/lake-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bangalore-t
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sewage-pollution
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environmentalists
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/biodiversity
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution